Remember the E. J. Potter method: jackstands while the engine runs in gear, drop the stand to launch.
A stand could be used (the usual type has slots or hooks for the swing-arm ends, axle, blah, small wheels, and handles at 90°), handles up (relaxed) while on rollers. As the engine coughs, the handles go down and the tire clears the rollers. Idle for a minute to heat the engine up, push the bike (still on the stand) away from the rollers and let-r-go.