I am not looking to shoot handheld with MF. But as for movements, they will allow me to put the plane of focus as not parallel to the film plane. For example with damsels in 35mm, there is only one plane where the entire body will be in focus. If you want to try something different - like a 3/4 portrait, you have to choose one plane (usually the eye) to be in focus and then play with DOF. This is mostly sufficient, but I am not planning to move to MF for macro for the larger film - it'll only be attractive if it opens up new possibilites. For example, this might be a shot I'd have made differently with a camera with movements. I could have shot from a bit higher up and had the entire body and wings in focus.I'm puzzled by your desire for movements. Remember that swing and tilt are used in situations where it isn't practical to position the camera to make the film plane parallel to the desired plane of best focus. In macro work its usually possible to move the camera or subject to accomplish that. And swing and tilt -- but not rise and shift -- are pretty incompatible with shooting handheld.
I actually enjoy working with enlarging lenses and have never yet forgotten to stop them down on the F3 or had critters fly away scared by the movement required to do so (though plenty fly away during my first approach with the camera/tripod) even with hoverflies with a working distance of an inch or so.Enlarging lenses have to be stopped down manually before exposure, but focusing and composing are best done with the lens wide open. So you're going to have a hard time with mobile subjects if you shoot with an enlarging lens.
Well, this might be too much work - if I do this it'll be for still objects on my Shen Hao.About putting enlarging lenses in shutter
Finally, I am NOT looking to get a parallel MF system for macro - so buying macro lenses for Pentax, bronica etc is out.
Just brainstorming about new possibilities for my existing stuff. For the conventional demands of macro photography my F3 based Nikon system is just about perfect and I've spent years suiting it to my needs. Just a little more tweaking with the flash setup and I'll have it exactly right with 35mm.