A Riese & Müller Birdy 3 Touring with 10s derailleur will be faster than the T-line and as fast than Helix but much more comfortable due to its 50mm wide tires and full suspension (it rides also pretty well on unpaved trails, its special front suspension that doesn't dive when braking is excellent).

It folds almost as small than the Brompton (much smaller than a Tern X11), there are multiple possibilities to carry bags on it (full size rear pannier, front low rider, Brompton front bag).