I want this mothafuggin mod right now!
http://0-the-leviathan-0.deviantart....od-9-175280742
A FEV gun? Sounds good to me! He also made a deghoulification gun too for a mod.
There are pictures in Leviathan's Scraps gallery of a few other FMGish mods, but those are a wee bit more in line with what one can imagine when they think 'female super mutant' and as such can frighten some folks.