I feel maany folders fit and handle better with drops
Have a look at putting tt type on a brompton. Ie little pixels thread using a santori handle bar extention or my brompton with dahon andres stem advice thread. Other compact alternatives include mezzo ( difficult to find but foilds simular size),, or the lighter bigger birdie,dahon curve or used presto.Mobiky genius?
Sounds like you prefer a 20 dahon/ tern.