Update on my psychotria:
I've come up with a method that just might work for transitioning my P. viridis out of the terrariums and into a lower humidity. A few weeks ago while food shopping I found that some snack foods (mostly just cheese balls or pretzels) come in these large, transparent, barrel shaped plastic containers (a little bit bigger than the jars I have). So naturally I bought one, and once it was empty I cleaned it out and removed the label (had scratch at the label a bunch and leave it under hot water for a while, still a little glue residue but not enough to matter), once that was done I cut several holes into it. I then took my healthiest of the taller plants I have and placed it into this container.
The idea behind it is by having it in this plastic container, every week (maybe longer depending on how the plant looks) I'll cut another hole in it, slightly lowering the relative humidity, and once it can be removed and survive in whatever humidity my apartment is at, I'll just tape up the holes and repeat with the next plant that's ready to be acclimated to a lower humidity.