Would you consider adding a config option to turn off the trading stall and add a catalog item instead for activating the trade GUI? This would give more options for mod packs.

Closing this due to above reasons.

I really like how the appearance of the merchant turned out, so I don't think I'll be adding a portable version anytime soon.

I don't really see the need either, as in, what does a modpack gain from making you use an item instead of a block?