Pat is a client just like Winlink Express so it cannot be configured as a server.
Look into the BPQ system from John Wiseman, G8BPQ. His system provides multiple functions such as BBS, forwarding BBS, Chat, digipearter, RMS. You can even run Wordle. I run a system on a Raspberry Pi 4B with Direwolf for our club. I think Pi 4 is minimum for Wine which is only required if you want to run Vara.
I would suggest you follow the BPQ32
groups.io forum if you go that route. Lots of helpful people and John chimes in now and then.
Good luck.
Dave
WB9TEN