Okay I'm back from my personal hell after our discussion above.
Apparently Mayflash devices work on Nintendo Switch 2 specficaly in red mode, not the purple one. I ordered Magic NS 2 to verify the claim and will arrive next week so if any of you got a Mayflash from Quadstick's shop, please try using it in red mode, otherwise I'm doing it myself next week to see f it can work even using a Titan One acting as a Xbox 360 and then inserted into the Mayflash tobe seen as a Switch controller (which would allow the usage of eyetracking alongside the Quadstick, too, which is my current setup).
Considering the Mayflash Magic X does work with the Quadstick and features a red led Switch mode as well, I believe it might help playing with Switch 2 until a other USB adapter manufacturers (praying for ConsoleTuner so hard there) catch up and make it work natively.