I was under the impression what you had written on the other page was what you already had and were only considering switching it to full wave rectification - that sounds fine either half or full if you have the mini rotor. If it's your plan - it sounds fine too.
If you have this ignition (mini rotor), you'll probably be fine with half-wave. Nobody seems to be having issues with them and I'm not entirely sure there's an easy way to unground the light coil.
If you have this ignition (inner rotor) - you might give full wave a shot. Half wave is barely enough to run LED's and certainly not halogens - I haven't had much luck with mine either and I haven't tried half wave yet.