I was having this conversation yesterday at the hot cross bun run. I'm 5 foot 4 with a 29 inch leg and I struggle to touch the ground on most bikes. I also own a pair or Daytona Ladystars which give me an extra couple of inches instep, as scotty mentioned.
I was talking to Bondy (was trying to buy her street triple, more like...lol) who told me you can get any bike lowered if you do it properly - she's had hers done and its made the difference in me fiat footing on hers and being a couple of inches off the ground on other triples I've tried.
I currently ride a Honda hornet 600 that hasn't been lowered and I'm fine on it; you're welcome to try it for size, maz.