Are you sure your head gasket is blown?
I notice you mentioned the leak was on the left side in the first post. Now, your saying it is an oil leak.
There aren't any real sources of oil on the left side of the cylinder (left being on the left side as your sitting on the bike).
There is a good possibilty that it is an oil leak from one of the rocker arm covers on any side and because of the air currents blowing around the head while your riding these little leaks can end up accumulating anywhere around the top of the cylinder.
If it was my bike I sure would assume it was a rocker arm cover leak and try to stop it.
Removing and reinstalling the rocker arm covers doesn't involve messing with the valves, springs, push rods or anything else. They are just covers.
That task is pretty simple just requireing removing the rocker arm covers, cleaning the gasketed area, applying some Permatex Ultra-Black to both sides of the gasket and putting the cover back on.
Course, not knowing which cover might be leaking, I'd do it to both.
This is at most a hour worth of work with no special wrench torquing and if it fixes the problem you've saved yourself a hell of a lot of work + your bike won't be out of commission for days or weeks as you wait for new parts/gaskets.