I'd do the grease trick on a lawnmower, tap a little, remove, clean, re-grease, tap a little more, remove, clean re-grease, etc.
IMHO on a motorcycle (one you like
), it's worth the afternoon (3 beers) to rotate and pull the heads, I'd insert both heads. It's not that hard to rotate and the easy access guarantees you'll tap it square. Besides, you need lifters anyway/ rocker gaskets/ etc. How are the jug gaskets on a bike with 50k on it? Lots of might-as-wells while your in there.