A Triumph twin is a lot easier to kick start than a 600 trailie. The kickstart isn't three feet off the ground for a start. Years (many) ago I did a trip to Greece on an early 650 Yamaha twin with a friend on a 650 Triumph. The Yamaha was electric (+kick) while the Triumph was kick only and there wasn't a great difference between them when it came to starting. Good choice of engine if it hasn't suffered from the ravages of intervening time and you're not looking to spend much time on motorways.
Yamaha on the left, Triumph on the right
So what are you going to do on the electrical side? Presumably you'll be leaving the alternator on the engine and using a capacitor in place of the battery? If it's weight saving that's binning the battery and you're aiming for 150kg, I don't think the Triumph or the Yamaha weighted much more than that anyway. You could use one of the new lithium lightweight ones (under a kilo) and get the best of both worlds.
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