I've build lots of various motors on a professional basis so changing a head gasket isn't a big deal for me however, I'd be real tempted to clean the leaking corner very well then use gray Euro silicone to form a patch. Gray silicone is stiffer than blue / black. The key is having the surface completely clean and work the silicone towards the joint from both sides.

Yes, I know it isn't the proper way, but other than time and some chemicals it isn't a great loss if it leaks later and the leak is non fatal to engine operation. This patch gives you time to drive the car for a while and asses it's other needs.