Not such a longshot after all. The BeBook One is a Hanlin V3 clone, usually the V3ext variant, and I just published a rebuilt OpenInkPot image (daily build 20120301) for it, tested on a real device:
https://github.com/Forger7/hanlin-v3ext-openinkpot
To check that yours is a V3ext: with the original firmware, the internal storage shows up as about 450–500 MB over USB. A plain V3 shows only about 9 MB and needs a different image.
There is also a thread about it in the HanLin eBook forum, still waiting for moderator approval.