Hi, Steve,
It's a shame that RC doesn't have any kickstart levers at the moment, but the levers are the same on all 90 and 100cc Bridgestones, and also on the 50 S[port and 60 Sport models. That might give you a few more possible sources for a used lever. The Rockford "Taka" also used the same lever, I believe.
Hope that helps,
Graham