Update to my own question: the T3U line uses the Realtek RTL8812BU chipset. I know very little about Linux, but does this link show that it has been unofficially supported for a while by 3rd party drivers, and officially since Kernel 6.2, very recently?
https://linux-hardware.org/?id=usb:2357-012d
Does this mean that due to the timeline it is probably not currently supported in Batocera, but the Batocera dev team can now add support in an upcoming version? And / or will I be able to add this driver myself in the meantime? I understand I would need a binary of the driver- where would I be able to find that for the ‘official’ driver?
Hope someone can provide a bit more insight!