No, I'm using a HooToo TripMate Mini (HT-TM03) which uses the same SoC and seems to work fine out of the box, but I had to build my own OpenWRT image based on a hodgepodge of current trunk and Wingspinner's HT-TM02 work.
EDIT: Actually there are quite a few boxes out there that do have CDC support built in. The ASUS WL-330NUL uses a stripped down ASUSWRT and has CDC support built-in. You can get the firmware source and build your own version if you like. It's not as friendly as OpenWRT (which is saying something) but is workable if you persevere.
Interesting. Did you do much hardware-wise for that - like rewire USB D+/D- signals and add/remove some obscure resistor that enables USB gadget mode?