https://www.nexusmods.com/newvegas/mods/45739/?
To possibly "skip" the time frame difference between the two game, how about a "while traveling to Nevada your train/transport was hijacked/crashed...", starting in a random location as is, instead of Doc Michell's house, kinda thing? Something like, if you have an existing character on the F03 side, randomize where you land, even in hostile territory, or have a crashed train somewhere, place the player and spawn those that "caused" the crash around them. At this point, your faction, etc.,. is already chosen by your actions along with your gear; wyciwyg -> what your carrying is what you got.