Yep. Lots of 17s, 24s, Mustangs, Mossies, Lancs etc that dropped into Switzerland.
Sweden got quite a few dropping in there as well. The USAFM B17 Shoo Shoo Baby was one of those that was interned in Sweden.
As for Portugal. During the early part of the war, P39s and 38s ferried out of England to North Africa. Some got interned in Portugal.
Jack Ilfrey of 1st and 20th FG fame, was one of those guys, but while showing the cockpit to a Portuguese pilot, he gunned the engines, blew the guy off the wing of his 38 and got away.
Dan/CorkyJr