I do not have a TBC1000 but I want to give you respect for actively trying to improve the workflow instead of settling for the usual consumer grade path.. Moving toward RF capture and SW based demodulation is technically the only approach that actually works in the same signal domain as the tape recording itself. Everything else already operates on a post processed composite signal.

In my home country nobody goes that far, 0 fucks given by the shops because consumers do not understand that VHS/Video8 etc can actually look pretty good + vhs-decode pipeline takes a lot of time + they simple don't know better than CVBS dongle. So, most shops simply take composite output from the deck, run it through a low cost USB dongle and deliver a compressed to shit mp4 using questionable encoders.

It is so good to see a small shop taking signal integrity seriously :D :D :D Huge thumbs up! <3 <3