That would be perfect. I know that boat builders had a similar plane, for "backing out" planks where they were laid on curving parts of the framework.The plane you are describing exists. One version is a gutter plane
I imagine there is a sliding dovetail the length of the plane and soles.The other type was used by pattern makers who developed a design with detachable soles of various set radiuses, with an iron for each.
Simpler than that. Normally just two countersunk screws on each base, fitting either into a pair of holes in the wooden main body (as in the old "secret screw" method) or, more likely, into a pair of recessed metal keyhole plates.I imagine there is a sliding dovetail the length of the plane and soles.