Do you want radio mounted permanently on the bike and remove the battery for charging ?? or do you want to use the radio elsewhere ??
Post a Pic of the rear of the radio may help ppl
How about a flat piece of aluminium with a mounting hole in the bottom corner the size of the back of the radio that mounts with a spacer to either of the clutch or brake reservoir mount bolts......then scallop the top of the alloy out to accept and cradle the belt clip of the radio up where it hinges to the radio, where the retaining hook is at the bottom of the belt clip, cut and file out a hole in the alloy to accept and retain the radio on the alloy ?? have this hole and the scallop at the top of the alloy with minimal tolerances so the radio is firm......
We modified similar on Sicmans bike for his radio.....PM him to post a Pic