Perm-I'd use a polish with fillers, then a glaze, and then apply a heavy carnauba. I wouldn't trust a sealant to bond to all those fillers.
I'd choose from among these products:
Polish: 3M SMR for Light/Dark Vehicles, Meg's #9, (maybe) VM.
Glazes: Meg's #3/#5/#7/#81/Deep Crystal step#2, 3M IHG, Blitz Omega, ClearKote RMG.
Wax: Blitz, Meg's #16, Collinite 476S.
FWIW, I plan to use an approach like this on some of my older, original paint cars that can't take any more abrasive polishing. It will probably work better than you'd expect.