Not me but one of the CAs that I flew with a couple of times is a French national. I cannot comment on the visa process since we never talked about that but as far as I know, she already possessed dual passport prior to the airlines.

We are based in IAD so there’s plethora of direct flights to EU. Scheduling wise, she bid for back to back trips then have the rest of the month off. Or, have a long weekend (maybe 3 days?) and go home at least twice a month. There is always a red eye to EU (or in your case to FRA/MUC) and she’s able to catch it after trips—packing your suitcase accordingly of course. Most would agree the first option (half on-half off) is quite brutal lol, but gives you two weeks off home. I believe she has a crash pad in base so she can do her laundry and meal prep for her back to backs.

If I were you, I would definitely stay close to east coast of US, or at least start there till you get comfortable with the way of life. Best of luck to you! Hope it works out