That question immediately sprung to my mind when I saw that. The SFAC stick is so hit and miss (doesn’t work on InPin) that it would be nice if people could get a $5 Xbox to USB adapter and be done with it.
My problem is that my SFAC is now using a PS1 DS and 360 PCB. I may order one, hook my original PCB back up and test it.
Here’s an eBay link for an example. This guy has a ton of them for $7 with free shipping.