Why couldn't you return the risers for higher ones? Also, a hard rubber spacer should have worked too. Suzuki used that method on the old bandit 1200s I had.
Another thought: you could have tried lowering the forks down in the triple a couple of mm's to give you the necessary clearance. Lowering the forks should slow steering but the "power steering" effect of much wider handlebars (as you are about to find out) would have negated that. Anyway, that's all water under the bridge now that you have LSL kit or can you still return it? :comp13:
Adjust the handlebar the way you want, temporarily mount the switchgear tightly but don't strip out the threads and ride it for a while to make sure you are satisfied with the positioning of everything; make adjustments as necessary. Leave switches in place and remove brake/clutch perches so you'll have room to add an alignment index to the bar with a piece of tape. The horizontal line where the two halves of the switchgear come together is a natural reference point to align the tape with. Next, remove switchgear and put a dab of dark grease or similar on the locating pins. Carefully reattach the bottom switch half with the alignment tape and press against bar. Remove and check for the dot. Remove bar, centerpunch the dots, and drill with correct size bit; too large of a hole and switch will move/rock.
Hope this makes sense without pics.