Not sure what you mean by "legit' runways.
If planes took off in fields or dirt runways, then what makes them less than a "normal" base runway?
Basically, I think ports should be primarily ports. If you're talking just non ordnance-carrying fighters, that includes the 109K, Ta-152, P-47M, Yak-9U, Yak-3, and Spit XIV.
All latewar, high-performance fighters, at least two of which you could argue are the best free fighters in the game.
If you restrict it to EW no ordnance fighters, you've still got the 109F (which can still fight with the best LW fighters), the P-40C, Hurricane Mk 1, C.202, Brewster, and Spit V. Effectively, this means you'll see about 60% of fighters lifted from ports being 109F's, a good 25% being Spit V's, and about 14% Brewsters. This would hardly get people into the worse fighters, and instead would serve only as a precedent for further expanding the air capabilities of ports and GV bases, which is honestly just a craptastic idea.