as for the wheel ,its purely a cosmetic issue ,but re the brakes thing ,can u skid stop? even if u can at best it scrubs off speed ,a front brake will b much better ,if u do go brakeless then ,imo ,ur a muppet and as u plough into a bus /car /whatever ul wish u had a front brake ,i ride with a couple of guys who ride brakeless and their bike skills are very high and even so they cant stop on a dime (as opposed tp a hand operated brake .
i had this debate with them and we tried it out ,yes knowing in advance they could kinda skid and stop and jump off in an emergency(but again they were expecting it )but in the real world its not the same ,please please please fit a front brake