Well, if it's an FTDI bridge (pretty common, and easy to get your hands on, in any case), then I'd be surprised if it wouldn't be doable. I looked into getting the FTDI driver on the N810, and I seem to remember hearing it was possible.

But yeah, I wouldn't count on OTG support, unfortunately. If you do end up resorting to the Bluetooth route, I'd be quite interested in hearing from you about how it works out. We've been working with these, and I'd be happy to share (both ways) information or feedback about those or other devices. Please PM me if you do decide to try that out.

Cheers