Not sure if it helps but "mischiefofmice" is one that I found you start in a Limestone biome which can be a difficulty to find as well. No idea if it meets your other requirements though.
Looks great! I suggest editing your post to include the version number that this was created on just in case there are some issues with future versions. I've posted it on our Instagram account as I think it's a great bit of ingenuity and should be shared. https://www.instagram.com/p/CyvaAkprBPk/?img_index=1
They don't see you because they consider the glass to be blocking line of sight due to it being a solid block. If you have some chiselled openings in it they may see you then. To avoid drifter spawn in the pit, add bright light sources like wall torches, a lot of candles, or lanterns at the bottom.
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