I would go binder, but consider these dips
Telekinesis makes Str combat maneuvers (trip, disarm, etc) work off Cha
1 Level of Marshal Cha to combat maneuvers (trip, disarm, etc)
3 Levels of Factotum gives you Int to combat maneuvers
2 Levels of Barbarian. 1st level allows you to take Wolf Berserker (UE) which is a regional feat but you can't take at any level not just 1st. Wolf Berserker gives you a +4 to Trip. Barbarian 2 Wolf Totem subsitution (UA lose uncanny dodge and trapsense) gives you Improved Trip which is another +4 to Trip.
Armbands of Might is another +2
Living Chain is another +2
Sweeping is another +2
Stone of Good Luck +1
Helm of Battle +2
Thus
Cha+Cha+Int+4 Wolf Berserker+4 Improved Trip+2 Armbands of Might+2 Living Chain+2 Sweeping+1 Stone of Good Luck+2 Helm of Battle
=Cha+Cha+Int+17
And this is before size modifiers. Size modifiers are really easy to get due to malevolence. Let me possess you mister hydra (huge size +8), let me possess you mister roc (gargantuan +12)