Conversely, one could argue that it's easier to switch ANSP with a remote tower operation.
All the airport has to worry about is the big pipe that feeds data to the remote tower.
To switch ANSP one unplugs the feed from the socket labelled 'current ANSP' and plugs it in to the socket labelled 'new ANSP', who have set up their own remote tower.
From that simple, equipment-centric view it doesn't even have to be in the same country as the airport.
All the financial risk in terms of ATC equipment is forced on to the ANSP.
Interesting times ahead, no doubt.