I guess I can do the reverse method again. But i may need another bottle of fluid to get going again.
Even at $25 for the good stuff, it's worth it. Considering the struggles you've had so far, I'd be worried about the stuff you had starting to pick up some moisture from the air anyway. Not sure if that's a real risk, but I know DOT4 can be quite hygroscopic, so if the bottle has been open and the fluid pumped back and forth over a few weeks, it may not be ideal for a sportbike.