Tough you'd still need to raise your ML and spend extra pp.
Other than Reserves of Strength, which lets you break the cap by 3 caster levels, I know of no other way. I also believe strongly there's no other way, unless it's from some more obscure source.
However, I know of no easy way to pump your ML to insane heights like there is circle magic for spellcasters, altough there are a couple loopholes for (nigh) infinite pps.
So yeah, if this can be achieved, maybe that'd work for some spells with a power equivalent, but...