Perhaps I missed it, but in my handful of google searches on this subject, I haven't seen this suggestion:
I understand the DRM concerns of exporting logos books to free formats, so that suggestion is an unlikely candidate. How about Logos commissioning it's own epaper device. I would likely pay the same price as a kindle for this. I wonder if Sony or some other manufacturer would even build the device that would render logos' proprietary format. Like others have suggested, it doesn't need to be full featured, but just able to allow the user to read and a bit of navigation and bookmarking.
I guess an alternative to this is an android epaper device. Here's one, but it doesn't seem to be available yet, and hasn't a wide adoption. I can't tell if it's sized more like a phone than an ereader.