I have a source of switchgear for renthal conversions (including indicators, horn, lights on/off, dip/main) on one set of switches, you would have to fit a seperate button for the electric start. if anyone is interested i will find out a price and availability. I can also convert for most scooters so it will just plug in.
i'm thinking £20 plus postage. i can supply a seperate push button switch for your electric start too, you can mount it on your inner plastics near the ignition switch.
probably not unless you space it with rubber, use an old cycle innertube wrapped around the bars, then when fitted, cut excess of flush with the edge of the switches.
Second u said rubber i was already thinking along those lines. How comes it's so big. Considering nearly all aftermarket bars are 7/8"