Basically, the cost in items to craft your first crafting table and furnace (the gate) are acceptable, but after passing the gate, the cost for subsequent crafting tables and furnaces should be lower. This would help maintain balance within packs containing later game content than Pyrotech that are balanced around vanilla crafting table and furnace recipes.

My initial suggestion for achieving this was having pyrotech's crafting table and furnace recipes produce two new items (let's call them the toolbox and furnace igniter). Subsequently, the toolbox and furnace igniter would be used in recipes to make crafting tables and furnaces, but would be returned to you (like empty buckets in the cake recipe). They could possibly have damage values and eventually need to be crafted again. This could all be put behind a config option if players would rather just have the more expensive recipes.

What should I do with crafting_table.json, and crafting_table_template.json, and change it? Your recipe class is hidden too deeply for me to understand