All recipes below (that make sense) would also be possible in reverse via the combiner.

Semi-Major Change: The ability to dissolve armors/tools into the appropriate constituent materials, changing based on the durability of the armor

New Chemical: Prussian Blue (C18Fe7N18)

Blue Dye: Prussian Blue (x4, 100%)

All dyed wools result in x4 of their component dye materials (Han Purple, Indigo, Lead Iodide, etc)

Prismarine: Shard - Beryl (x, 100%)
Prismarine: Beryl (x4, 100%)
Prismarine Crystals: Beryl (x8, 100%)

Sandstone: Silicon Dioxide (x4, 100%), Au (x1, 4.00%)

Soul Soil: Silicon Dioxide (x4, 100%), Tm (x1, 100%)
Red Nether Bricks: Ge, Se (x8, 100%), ZnO (x2, 11.11%), Au (x2, 5.56%), P (x2, 5.56%), S (x2, 22.22%), Ge (x2, 5.56%), Si (x2, 22.22%)
Warped Wart Block: Cellulose (x9, 100%), Ge, Se (x36, 100%), Si, Hg, Nd (x1, 1.00%)

Eye of Ender: Si, Hg, Nd (x16, 100%), Ge, C, S (x8, 100%)
Chorus Fruit: Sucrose, Cellulose (x1, 100%), Si, Hg, Nd (x1, 5.56%)

Blaze Rod: Ge, C, S (x16, 100%)

End Rod: Ge, C, S (x4, 100%), Si, Hg, Nd (x1, 1.00%)
Lilac: Han Purple (x8, 100%), Cellulose (x1, 100%)
Rose Bush: Mercury Sulfide (x8, 100%), Cellulose (x1, 100%)
Peony: Arsenic Sulfide (x8, 100%), Cellulose (x1, 100%)

Shulker Shell: Calcium Carbonate (x8, 100%), Si, Hg, Nd (x1, 10.00%)

All Dead Coral: Calcium Carbonate (x8, 100%)
Tube Coral, Tube Coral Fan: Calcium Carbonate (x8, 100%), Prussian Blue (x4, 100%)
Horn Coral, Horn Coral Fan: Calcium Carbonate (x8, 100%), Lead Iodide (x4, 100%)
Brain Coral, Brain Coral Fan: Calcium Carbonate (x8, 100%), Arsenic Sulfide (x4, 100%)
Fire Coral, Fire Coral Fan: Calcium Carbonate (x8, 100%), Mercury Sulfide (x4, 100%)
Bubble Coral, Bubble Coral Fan: Calcium Carbonate (x8, 100%), Potassium Permanganate (x4, 100%)
Dead Coral Blocks: Calcium Carbonate (x16, 100%)
Tube Coral Block: Calcium Carbonate (x16, 100%), Prussian Blue (x8, 100%)
Brain Coral Block: Calcium Carbonate (x16, 100%), Arsenic Sulfide (x8, 100%)
Bubble Coral Block: Calcium Carbonate (x16, 100%), Potassium Permanganate (x8, 100%)
Fire Coral Block: Calcium Carbonate (x16, 100%), Mercury Sulfide (x8, 100%)
Horn Coral Block: Calcium Carbonate (x16, 100%), Lead Iodide (x8, 100%)

Basalt: Nothing (96.82%), Al (x1, 0.28%), Silicon Dioxide (x1, 1.38%), Mn (x1, 0.14%), Li (x1, 0.14%), Fe (x1, 0.55%), Na (x1, 0.21%), Ca (x1, 0.28%), Ti (x1, 0.14%), Mg (x1, 0.14%)
Blackstone: Nothing (96.82%), Al (x1, 0.28%), Silicon Dioxide (x1, 1.38%), Mn (x1, 0.14%), Li (x1, 0.14%), Fe (x1, 0.55%), Na (x1, 0.21%), Ca (x1, 0.28%), Ti (x1, 0.14%), Mg (x1, 0.14%)

Gilded Blackstone: Nothing (71.82%), Au (x4, 25%), Al (x1, 0.28%), Silicon Dioxide (x1, 1.38%), Mn (x1, 0.14%), Li (x1, 0.14%), Fe (x1, 0.55%), Na (x1, 0.21%), Ca (x1, 0.28%), Ti (x1, 0.14%), Mg (x1, 0.14%)

Snowball: Water (x4, 100%)
Packed Ice: Water (x144, 100%)
Blue Ice: Water (1296, 100%)

Mossy Cobble: Regular cobble materials, Cellulose (x1, 25.0%)

Crying Obsidian: Regular obsidian materials, Nb (x4, 100%)

Kelp, Seagrass: Cellulose (x1, 100%), Water (x1, 100%), Iodine (x1, 100%)
Dried Kelp: Cellulose (x1, 100%), Iodine (x2, 100%)
Dried Kelp Block: Cellulose (x9, 100%), Iodine (x18, 100%)

Ancient Debris: Sm, Tb (x16, 100%)
Netherite Scrap: Sm, Tb (x8, 100%)
Netherite Ingot: Sm, Tb (x32, 100%), Au (x64, 100%)

Grass, Fern, Dead Bush: Cellulose (x1, 5.00%)
Tall Grass, Large Fern: Cellulose (x1, 10%)
Crimson Fungus: Cellulose, Psilocybin (x1, 100%), Ge, Se (x1, 25.00%)
Warped Fungus: Cellulose, Psilocybin (x1, 100%), Nd, Hg (x1, 25.00%)
Crimson Roots: Cellulose (x1, 5.00%), Ge, Se (x1, 0.25%)
Warped Roots, Nether Sprouts,: Cellulose (x1, 5.00%), Nd, Hg (x1, 0.25%)
Weeping Vines: Cellulose (x1, 25.00%), Ge, Se (x1, 2.50%)
Twisting Vines: (x1, 25.00%), Nd, Hg (x1, 2.50%)
Bamboo: Cellulose (x1, 25.00%)
Sea Cucumber: Protein (x4, 100%), Iodine (x16, 100%)
Brown Mushroom Block, Red Mushroom Block, Mushroom Stem: Cellulose, Psilocybin (x4, 100%)
Sweet Berries: Sucrose, Cellulose (x1, 50%)

Dragon Head: Hydroxylapatite (x16, 100%), Og (x32, 100%)
Skeleton Skull: Hydroxylapatite (x4, 100%), Ru (x8, 100%)
Zombie Head: Hydroxylapatite (x4, 100%), Pd (x8, 100%)
Creeper Head: Hydroxylapatite (x4, 100%), Rh (x8, 100%)

Honey Block: Sucrose, Water (x16, 100%)
Honeycomb: Sucrose, Water (x1, 100%), C (x16, 100%)
Honeycomb Block: Sucrose, Water (x4, 100%), C (x64, 100%)
Honey Bottle: Sucrose, Water (x4, 100%)

Phantom Membrane: Protein (x1, 100%), He (x4, 100%)
Scute: Protein (x4, 100%)
Turtle Egg: Calcium Carbonate (x8, 100%), Protein (x2, 100%)
Nautilus Shell: Calcium Carbonate (x8, 100%)

Book: Cellulose, Protein (x3, 100%)
Paper: Cellulose (x3, 100%)

Golden Carrot: Cellulose, beta-Carotene (x1, 100%), Au (x8, 100%)
Golden Apple: Cellulose, Sucrose (x1, 100%), Au (x128, 100%)
Enchanted Golden Apple: Cellulose, Sucrose (x1, 100%), Au (x1152, 100%)
Poisonous Potato: Starch (x1, 100%), K, Potassium Cyanide (x4, 100%)

Raw Porkchop: Protein (x4, 100%)
Raw Mutton: Protein (x4, 100%)
Raw Rabbit: Protein (x2, 100%)

Ghast Tear: Water (x1, 100%), F (x4, 100%), S (x4, 100%)
Dragon's Breath: F (x8, 100%), Xe (x8, 100%)
Heart of the Sea: Si (x32, 100%), Hafnium (x16, 100%)

Sorry i've been a bit slow to respond, there are a lot of good suggestions here.

I wouldn't add biological stuff like "Turtle Egg" or head, but for addon it would be perfect!