Based on my searches, I could only find 3* controllers that have this feature (and interestingly, they all do it differently). There’s the new 8BitDo Pro 3, where the face buttons are magnetic, the GameSir Supernova, where you have to remove the faceplate to swap the buttons, and the GameSir Tarantula Pro/T3 Pro, where there’s a motor that swaps the ABXY layout.
This seems like a pretty simple feature that would be really useful for multiplatform controllers. Lots of controllers advertise that they work with PC, Xbox, Switch, Android, etc., but very few of them give you the option to physically swap the ABXY layout. They usually have one layout or the other. I would get not having these features on a really budget controller, but there are some controllers that are really expensive and don’t have this neat little button swap thing (instead opting for gimmicky things like a screen)
edit: * There’s actually 4**, I forgot about the Nyxi Flexi!
edit 2: ** Nope, it’s five***, the Gulikit KK3 Max has replaceable button caps! Very cool!
edit 3: *** Actually, the older KK2 Pro also seems to have this feature too, as well as a few other older Gulikit controllers, so I guess it’s >6? That’s cool. With four different companies (GuliKit, 8BitDo, GameSir, and Nyxi) offering at least one controller with this feature, I guess it’s not as rare as I thought. Who knew?
What I’m much more salty about is that controller manufacturers all seem to go out of their way to actively prevent you from just taking the controller apart and rearranging the face buttons as you see fit, usually by way of keying them with little fins around their sides when otherwise there would be nothing to prevent you from doing so. My Gamesir T4 Mini is this way and it’s infuriating, because even if you have Steam Input set to Switch controller mode, or whatever, half of your games inevitably give you the button prompt for that position on an Xbox controller anyway, and the other half respect the positions of the Nintendo style layout and you never know which is which until it’s too late. For PC gaming I’d much rather just reorganize the thing into the XBox layout which seems to be the most compatible default for games and leave it that way.