Normally, the 3D items in vanilla minecraft are always rendered as 2D texture in GUI (like Spyglass) and 3D model in hand, instead of flipping the model angle of items in the inventory. If the rendering logic design can be in the vanilla way, that will be more elegant.

Could you provide a full list of Create items whose models should be changed?

Could you provide a full list of Create items whose models should be changed?

Normally, the models are not need to be changed. I mean rendering the redrawed 2D pixel art icon in inventory but not 3D models style handheld items embed into inventory directly. When players take it in hand, then the 3D models are still there.

Here are the handheld items (unplaceable items) with 3D models:
(kind like Spyglass)

1. Potato Canon
2. Creative Worldshaper
3. Extendo Grip
4. Wand of Symmetry
5. Wrench
6. Handheld Blockzapper
7. Deforester