This data pack creates recipes for some illegal items, and some that you can only discover.
If you want to have every recipe unlocked, run this command: /recipe give @p *

This data pack adds these recipes:
Command Block
Chain Command Block
Repeating Command Block
Command Block Minecart
Barrier
Bedrock
Grass Block
Enchanted Golden Apple
Totem Of Undying

If you have some more ideas of items I could add, comment them on this post.