Bike friday pocket rocket..
https://www.google.com/search?q=Bike...w=1808&bih=959
Or will that just change the handling too much and be unsafe?
Overly Broad question, so the answer is like ... 42
still has to be comfortable to ride when you're done ..
my Pocket Llama has trekking bars on it; My Brompton M3L has Ergon grips, on their stock M bars.