Not sure if you mean the microsoft surface keyboard or an onscreen keyboard. I don't use the ms keyboard covers at all, haven't even purchased one (mechanical usb keyboards instead). I know there have been issues running the surface pro keyboards under linux, but don't know the current status.
On screen keyboards seem to work fine but I haven't put much effort into configuring, just tested.
Thanks, I will talk to my employer about this. They're quite slow. But I will eventually reach you through the contact details in the Google Drive document in case I want to figure out something.