To fit in with the "theme" characters, how about a pulp-'50s Spaceman-theme perk? Basically providing a damage bonus to any weapon that wouldn't look out of place on a show like The Adventures of Captain Cosmos, which IMO would be the following, as well as perhaps granting a bonus of some kind for wearing the Spacesuit+Helmet combo:
Space Cadet? A high-level perk that grants a DT boost so you can keep wearing the spacesuit when you should really have switched to something better, and then adds various benefits?
It'd be a lot easier to decide which weapons it uses by 'energy type' or ammo type (like Plasma, Pulse, Microfusion Breeder) than individual weapons, but given your list it'd be easy to cover them all like that.
The patch has unfortunately come out at the most inconvenient time, as Twin is currently away for a bit and my hard disk just died, so I'm in the process of redownloading FNV across a suddenly inexplicably terrible internet connection.