I've started on the height by ordering some 310mm shocks to replace the 350mm ones.
Last year I fitted rear sets, these gave me the folding footrests required by the regs but, while I found the left hand peg location OK I didn't get on with the right hand location.
Before fitting the rear sets I was using a set of clamp on footrests that I believe are rare original BSA scrambles items. Rather than modify the original parts I made a new top half of the bracket that placed the footrest lower and slightly further back.
I'm quite pleased with how its turned out.