I am looking forward to my next trip to Frankfurt or Zurich. I get the clubs somewhat check for vaccinations proof. I have that. I would like to get a better idea on airport and country entry experience for fra or zur. Can someone share their experience and issues?

I'd go to Frankfurt.

Airfares from the East Coast to most of Europe now...are off the charts....and Im far from broke.  Hit P2 in Budapest in December and it was fantastic....just looked at the airfares....40-50% higher....ugh

Is it an Fkk?

yes its essentially a brothel....more similar to Babylon in Vienna...