One more update, for anyone interested:
I picked up an Inkbook Prime after hearing that it supported bt keyboards. The good news was it did. The bad news was the refresh on the device was unusably slow. It was clearly not meant for input of any kind.
So I sent back the Inkbook, sucked it up, and bought a $220 Likebook Mars. It's twice my intended budget, but it works (and works pretty well). There are a couple nitpicks here or there (like the constant ghosting, no matter how you set up the refresh rate) but for the most part it does what I was looking for so unless I hear about a better, cheaper option before my return window closes, I'll probably be sticking with this.
Thanks for all the input and advice, everyone!
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