Thanks
It's for the best I suppose since I was only interested in it for the novelty value. With the Super Game Boy and Game Boy Player connected to my Trinitron and the Retron 5 coming for my HDTV one of these days, there was no practical need for this adapter.
But it still would've been neat playing GBA games via my Super Nintendo.
I hardly think it's outlandish like you're portraying. They need to program a bios anyways since they just can't utilize any Nintendo code since it's all protected by copyrights, it's meant to plug into a Super Nintendo cartridge port be it a clone or the real deal, and it's actual clone hardware contained inside just like how the Super Game Boy and Game Boy Player had the actual hardware inside.
Taking it one step forward beyond just receiving power in order for it to be seamless just makes sense to tap into the Super Nintendo hardware to route the AV out and interact with the controller plugged into port 1. They don't even need things like borders or even a UI. So it was a very reasonable question even though I was obviously skeptical that it would work out that way.