Well, if you can't get it out, there is nothing special about the master, other than it came from your bike.
So, you can get a master from any other dual disk cb, goldwing, any bike with 7/8th inch bars really.
The only requirement is that it actuates the brake light the same way.
So you can either see if someone here has 1, post in the wanted/for sale section. Check ebay, if you have a bike boneyard, check with them. Or you can always buy something new.
The ride IS the adventure. The destination is just to get gas!