well...if you want to do it with the most flexibility, you get a 2x3 view camera or a rollfilm back for 4x5 or 3x4
I suggest a speed graphic 3x4 WITH a roll film adapter---I have such a combo and it is the best solution I have found
MF converter lenses are limited and VERY EXPENSIVE
the speed graphic with rollfilm provides much versatility--you can even mount your favorite MF lenses to it and use those with the focal plane shutter.
this is the cheapest alternative.
right now I have the parts to mount my hasselblad lenses to the crown graphic---put that with a roll film holder and BAM got a tilt shift macro medium format camera for VERY cheap and VERY versatile.