Why wouldn't you just get them to log into the workplace network by using citrix servers? If they have some requirement for a specialised setup then they can just remote from the citrix boxes into a desktop (virtual or otherwise). I mean, why bother with what they're using at home? It's what my workplace does. Citrix farm for remote working and I can rdp into any number of machines including my desktop and VMed calculation servers for more specialised work.