Emulation side support would be easy if someone writes video stream to binary data converter. Adapter does nothing more than convert video signal to binary and routes it to Amiga serial receive port pin.
Conversion should not be that difficult, each visible scan line has 4*11 bits of data. 4*(start bit + 9 data bits + stop bit).
I might consider doing it if I get at least first few minutes or so of video from beginning of backup
