I was very fortunate to find a semi-compatible stock ROM image from the TechKnow site at http://www.techknow.t0xic.nl/forum/index.php?topic=4299.0 (requires login to view). It's not exactly the same, but it does result in a working Android installation. The touchscreen has a 1cm offset, which seems a common problem, but since most stuff will be done using ADB anyway, that doesn't matter.
Here's a screenshot of the About tablet page when using the stock ROM:
The icons at the bottom are slightly bigger, the model number is different, and the build date is as well.
Extract the ZIP from TechKnow - there will be a file called Q88.img. This can the be used with LiveSuit to flash the tablet.