I've just had an idea - my monitor, mouse, keyboard are all plugged into the dock. The laptop connects through one USB-C cable. So If i get a small tower PC then I can simply unplug the USB-C from the laptop and insert it into the PC tower? I guess I'll have to make sure that the PC Tower has a suitable USB-C slot, or I may have to buy an adpator but that's fine.
I'll only be running Reaper music recording software, so won't be a huge load on it and I'll only need the one monitor
That will work, especially for occaisional use.