I know that you can change the recipe of a pattern, but it would be useful if you could put one in a crafting table to clear its NBT data so that you can stack it with other blank patterns.

This is already possible. Please consult the wiki first: https://refinedstorage.raoulvdberge.com/wiki/pattern

Whoops, I’d no idea.

Funnily enough, I’ve actually done this before, but I had completely forgotten about this feature. My apologies.