20" wheel bicycles does handle quite nice, the last one I used were an old shopper that i made lighter with just a single coaster brake, it was fun and nippy to ride, with a proper frame, I've no doubt it'll be even better (since the shopper flex and weight a tons to compensate for the lack of triangle).
You could ask the same question to Alex Moulton.
20" wheel bicycles does handle quite nice, the last one I used were an old shopper that i made lighter with just a single coaster brake, it was fun and nippy to ride, with a proper frame, I've no doubt it'll be even better (since the shopper flex and weight a tons to compensate for the lack of triangle).