From your description, it's not entirely clear whether the fault might be limited to the master cylinder/reservoir, which is one assembly, or the throttle assembly which also holds the brake lever. Can you determine if the bend/break/etc is limited to one or the other?
In any case, I see several sets of the whole right-hand throttle+brake assembly on eBay, for $150-200. If you're lucky, you'll get one that's good and operational as-is. You might, when you get it, also find that you need a master cylinder rebuild kit, about $70 at BeemerBoneyard.
