I am running MCA (1.12.2-5.3.1) together with Ruins, and Jordan Peacock's extra ruin sets. Unfortunately, there's a problem: Some of those ruins create (via command-blocks) villagers with heavily customized trades, and MCA is duly overwriting those with MCA-villagers... with randomly chosen trades.

What I'd like to see is some way (perhaps an NBT tag) for a command-block-spawned villager to tell it "don't overwrite me"?, or at least to keep its profession, trades, and name through the conversion. This would need to be something that wouldn't affect the villagers if MCA is not installed -- that is, it makes such villagers spawn properly whether or not MCA is present.