DV
Yes, you should be able to.
I was flying a couple of years ago from Ostende to Rouen, five minutes before landing the ATCO told me that the ATC was now closed, continue in French, this I did.
I realised when on the ground, I did not have the relevant French number to close my flight plan (the Rouen Pilot's Office was also closing), so I phoned the number I had, Ostende.
They were very helpful & closed the flight plan for me.
FB
