Request : POI Helper to add new blocks to existing villagers

[xanthian]

This was briefly discussed in Discord last night.

Probably quite a niche use case but for example Mod added blocks usable by Vanilla Villagers (eg Weaponsmith)

This is possible with an Access Widener, Mixin and a rather cursed registry class

AFAIK Quilt has this ability but I don't intend on using Quilt any time soon.