The wide cameras are mainly designed for architectural work with wider lenses than you are using--tall buildiings where you can't move back far enough and cramped interiors, where the only movements you really need are rise/fall and shift, and the bellows is likely to restrict movements with a conventional view camera (of course some cameras do this better than others and have more bag bellows options, etc). They are small enough to handhold, but they don't in general have rangefinder focusing. You haven't said how long your studio is or how wide the set is, so it's hard to say how wide a lens you'll be using, but figuring you'll be in the 90-120mm range, I don't see why you can't just use a regular 4x5" view camera. You don't need infinity focus in the studio with a lens in that focal range. In the studio with models in what sounds like a fairly controlled situation, I don't see a reason to shoot handheld, and the wide cameras depend on groundglass or zone focusing, so handheld with a non-rangefinder camera isn't precise or practical enough, if you're printing really big.
On 4x5" you'll probably want to be around f:22-32, so it makes sense to use strobes with models. It's possible to do it with 8x10"--after all it used to be standard to shoot furniture catalogues on 11x14" in studios designed for the purpose--but it will take a lot more light to be around f:45-64, and don't forget that bellows factor increases with the larger format, so you will need 3-4 stops more light to shoot 8x10".