i dont think you know how it works. if we were to have SWR in Train Simulator or TSW DTG would need to obtain SWRs License they did SWT because SWT does not exist anymore! also this thread is so linear what trains? its not just about having your local station simulated.
SWT trains rebranded to SWR in 2017 with new liveries but they are keeping the older ones also same with London Midland they rebranded to London northwestern railway.
It's not as simple as that, by any means. They need to acquire a license for the rights to use SWR branding, liveries... as well as to create and use the Class 444/450/455 in TSW? Think carefully. And it's not just about wanting your local station.