Strida doesn't ride like a normal bicycle.
True enough, yet folks worldwide have ridden Stridas enthusiastically for the last 36 years. If the OP needs to ride a 'normal bicycle', they have their Tern Verge X11 ("ridden all over Paris"). The OP's use envelope is 'last kilometers, combining with overcrowded transit'. That's basically the Strida bike's design brief. It takes up very little if any extra room on transit, being held upright between the rider/owner's feet & the clean belt drive not greasing anyone's Paris designer clothing. Fast, simple fold, too.
I dunno. Seems like it would be worth a test ride.
I can think of another couple of possible bikes that might suit
the parameters, but...
Let's be honest, there is only Brompton.
...the OP's mind seems to be made up. 
The T-line would be great, but it's very, very expensive.
Start saving those Euros!