Here I go overthinking the problem again, but maybe there will be something useful in my ramblings. What if you made the sanding block so it has two holes drilled lengthwise for two steel rods. The sanding block would slide back and forth on the rods. The rods would ride on the templates and would follow the radius as the block is moved side to side. I think you could set this up in such a way as to not require much distance between the template and the ends of the fretboard, and I also think it could prevent the rounding over of the edges of the fretboard that folks say is common with sanding blocks. By changing out the templates you could do different radii or compound radii.
I might be missing something in my brain dump... I wouldn't know until I thought it out some more or tried it. I would probably opt for marking the ends and handplaning the fretboard or setting up a power tool fixture, but for a sanding block solution this might work.
pd
"... beauty is not found in the excessive but what is lean and spare and subtle" - Terry Tempest Williams
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