Ahh thanks for the update! Hopefully ongoing progress continues to go well-- best of luck to Cadiboo on that! Since release for my mod isn't imminent, I may hold off on this feature until the mod gets a bit closer to going public, however it's great to know that there is a workaround in case I finish my release before the interface is ready. Thanks!
That's what the containerItem thing I mentioned is for. It leaves an item in the crafting table after being crafted, which is what they seem to want. It's also used for other things, like potion bottles and water buckets.
I thought so, but I don't know how... been looking around for ways to do that but I haven't found anything specific to my situation, just for PlayerEntities.
EDIT: Nevermind, I've got myself on the right path now. Once again, thank you so much for your help. It will take me time to fully understand all the concepts I've come across but I know where to take it from here.