Using swings and tilts requires shooting from tripod. If you're going to shoot hand-held you'll need to use a rangefinder to set focus and a viewfinder to frame. Many, not all, press and technical cameras have both.
If you're going to shoot from tripod, a short monorail isn't that much more difficult to use than is a press or technical camera. But monorails can be heavier and bulkier.
If you decide you want a 2x3 monorail, don't fixate on the Galvin. In the late '80s when I first contemplated moving from 35 mm to 2x3 I had the opportunity to play with a 2x3 Galvin. Light? Yes. Crude? Yes. There are other 2x3 monorails that are much nicer to use. These days I have, in round figures, 2 1/2 2x3 Cambos and more bits that let me mix a 2x3 front and 4x5 rear so that I can use a 6x12 roll holder. I also have 2x3 Graphics.
Cambo isn't the only firm to have made 2x3 monorail cameras. Arca Swiss, Cambo, Linhof, Plaubel and Toyo have made (AS, C, and L still make) 2x3 monorails. And I'm sure I've missed some. If you decide to buy a 2x3 monorail, be alert to all possibilities, don't fixate on the one true make and model. Of the ones I handled, the only 2x3er that I really disliked was the 6x9 Linhof Color, a Technika on a rail. Very heavy, no more movements than a 2x3 Technika, and very tall.
I didn't mention Galvin. I didn't like the one I played with and they're quite scarce. As I said, don't fixate on a particular make and model. Grab what's available and fits your budget. If your budget's tight and you must shoot 2x3, give up movements and look for a 2x3 Graphic. Century/2x3 Crown Graphics are much better for short lenses than are Speed Graphics.
If you want to repurpose Mamiya Press lenses, fine, wonderful. But understand that after you've taken a lens with shutter out of its Mamiya barrel it will be much like other view camera lenses. It can be mounted on a board that fits your 2x3 camera and that has a hole that suits the lens' shutter. All perfectly normal, nothing special required. This because Mamiya Press lenses aren't cocked or released by an internal linkage in the body. I've used a 60/5.6, more use recently a 58/5.6, Konica Hexanon ex-Koni Omega. These lenses have to be reshuttered to be used on, e.g., a Graphic because their native shutters are released by a linkage in the body.
I have no experience with Mamiya Press lenses, have no idea how large their image circles are. Charles' point about lenses for MF is well taken but there are exceptions.