Yeap St. Cyr looks like it'll work and the nearby trains are a bonus. The plan is Forfar direct CLN @7500 with minor dodges for a few restricted & danger areas, drop down to 3500 prior to CLA to stay under the TMA, direct LFAT. Clear customs, refuel then LFAT,PON,St Cyr @ 2000. Then on the return, reverse the route but St. Cyr - Forfar nonstop.
Only issue I'm seeing is LFR324 (surface-2500) around St.Cyr looks like its active everyday but as long as I get a transition on the published frequency I'm good to go. The Paris boat show awaits !!