Can't you shoot a beam into a struggle to help push it? Couldn't you just charge a Kamehameha and use that to push it? If your Kamehameha isn't strong enough to enter a ps with the spirit bomb, then being able to pump energy would be useless anyways.
All in all, it'd be rather pointless, as I haven't seen anyone dumb enough to enter a power struggle with a spirit bomb instead of just dodging it. (Big SB, that is, not the second function tiny one.)