I asked, got ignored but pFBA supports single joycon mode which should hold you off a bit before it is implemented.

 

Can you find it again and post it here?

 

I uploaded what they sent in the discord. It's not much, but I hope it helps. You can also search in the discord #retronx-support channel on Sunday (aug 5th) around 1am. It sounds like this might not be able to be done in the regular controller input mappings - you might need to go in the core/game specific remappings to get it to work. Again, I didn't do this myself so I don't know the details.

 

or you know buy a pro controller...

 

8 bitdo adapter for 20 and uses various controllers I use my ps4 controller to play while docked and a wired switch controller for like another 20 i think its what i paid at gamestop.

 

depending on controller all you have to do is put your controller in pair mode and then push the pair button on the adapter then it should automatically pair. for the ps4 you hold the PS button and share button which will put it in pair mode. i believe there is a website from the manufacturer with a list of all or most compatible devices to use its a pretty broad list. this is the one i use http://www.8bitdo.com/wireless-usb-adapter/ which is very nice looking considering its sticking out of my switchs dock. and I can also hook it up directly to my switch without the dock in portable mode but you need a usb c adapter and i had one which came with my S8.