I believe you can adjust the CMB value, not sure if for a specific type of Combat Maneuver.
You could make an adjustment that raises the CMB (or the Trip CMB, if you can do specific maneuvers) to however much higher your CHA is, then have the correct value when the adjustment is enabled.
Kind of a work around.
If you only want the adjustment when doing the one action, it would probably be easier to just manually note that your CHA is 3 (or whatever) higher than your STR bonus and add that mentally.
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