with SONY a7R2 + Minolta portable bellows +
SD mount glued to 49-55mm step up ring(←) +
55mm - 40mm step down ring(←) + the lens

Magnification: X1.29 ~ X2.77

Instead of making the above DIY adapter(←)
you can use 42mm - 55mm step up ring after installing
M42->Minolta mount adapter, probably easier to do so.
All off the shelf items but the magnification range may change,
also you can use M42-M42 helicoid adapter instead of bellows.