UNI is good commuter and if u still loves to modify it --- there are ways.....
Go for the P150UG3 handle bar--- they fit well on UNI and provides u a lean seating....U can have a bigger tyre ---- Pirelli or MRF 120 will do the job....But u may loose the initial Pickup and handling may be not the same of stock conditions....
Lost but not the least
AFAIK modifying UNI will purely damage its image .....