hello,

It may be safer/more effective to replace the handlebars, though I think a repair is perfectly plausible, especially given the cost of a new set. Has it cracked all the way through or is it a surface crack? Personally if it has cracked all the way through, I would probably try to get in there to clean it up and prep it, then get some structural epoxy adhesive in there. Then put your reinforcing layers over the top of that. Of course that is going to make the repair rather more expensive, so up to you as to what you want/need.