Absolutely fix it on your own. What I'm saying is, without knowing your mechanical skills, is that with any fastener on the bike is 'Don't take any shortcuts'.
These motors and frame parts are relatively fragile say, compared to a cast iron block of a pick up truck.
In other words, you have a dull screwdriver close at hand but your brand new sharp Japanese DIN screwdriver is in the house...take the time to get the good tool. Try to use a six point socket instead of a twelve point. Things of that nature.
There's all sorts of videos on YouTube showing various methods of getting stuck fasteners out but I gotta say, the bar end screws are among the biggest PITA.
One method I did see for a stripped socket head bolt was to fit the Allen head wrench (a good sharp one) into the bolt then take a center punch and bang dimples into the head of the bolt to tighten up the metal around the Allen wrench but there's not a lot of room inside the bar end.
Let us know how you make out.