Ok, so I've noticed that /spawner on any of those 3 mobs simply doesn't work, which sucks, big time, especially since all they are are reskins of currently available mobs! The only differences being that Strays can drop slowness arrows (which can easily be disabled) and Zombie villagers can turn into villagers if cured (which doesn't matter since you can't nametag villagers, they despawn, AND you can't even trade with them, honestly, just disable zombie villager curing, its pointless). Lets enable these! Even if strays drop slowness arrows it doesn't matter, since we can give bows the infinity enchantment, which lets 1 arrow be used infinitely (which only works on normal arrows, not slowness arrows). Also, for zombie villagers (I don't know about husks since im not in the right biome) they can spawn naturally, I remember farming them until I had enough for a small room, curing them all (which at the time I had no rank and saved for quite a while to cure these) only to realize they would despawn and were useless. So why are these even disabled? Honestly... But yeah, lets enable these, there really isn't much harm in this and it adds variety to spawners!