I can confirm the Roadrunner works. I have the ECU with the emulator on the table right now and VAG-COM connects.
For checksums some things have to be patched and ECU has to be coded into test mode.
The case has to be modified to fit the emulator board.
Also, there is a problem where you have to endian swap all binaries that you upload, because otherwise they come out wrong.
This one had me tearing my hair out, until I decided to boot mode the ECU with the emulator attached, read it out, and found the entire readout endian swapped.
Uploaded the same readout to the emulator and now boot mode readout was fine and ECU started to communicate.
Just about time. Screw flashing