The WebBrick Gateway is available now as an "Appliance" product, in an embedded PC/X86 pizza-box form-factor, and will soon be available for installation on Windows platforms.
We are willing to consider any number of other form-factors and architectures, but will need to guage the engineering work needed as it compares with the purchase volume you're committing to.
The QNAP 209 Pro appears to be an ARM machine, running Debian Linux in at least one configuration. As such, the work involved in compiling & installation should be relatively small, but it's still work for us, and the testing of any new platform is not insignificant.
Please do get back to me in private email with details of your proposal, so that we can quantify this opportunity.
-- thanks, Alistair
Business Development Director.