I agree with most of what Chagzuki said. A tikit is compact enough to take into the office, but if you want to take a bike into *shops*, I think the Brompton remains the best choice. And, realistically, a Tikit with a rack is going to weigh around 28 lbs, which is not much less than your 30 lb Brompton.

Can you describe when, specifically, weight is an issue? And are there times when you don't need the 12 speeds? There are people with two Bromptons; one a fully featured model like yours, and the second usually being a rackless two-speed for when weight matters...the latter weighs around 22 lbs or so if you don't opt for titanium.