Re: Is this possible???
Certainly. Many motorcycles do it that way. You'll get some arguments from those who will tell you that drilling holes in the handlebars will weaken them and be dangerous but if factory built motorcycles do it, why is it less safe on a motorized bicycle?
Unless you're doing some serious off road riding, jumping, curb hopping, etc. You'll never compromise the handlebar integrity by drilling holes large enough for cables or wiring.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"