I was hoping that if there were an Opportunity in either Jemal's game or yours Ant that I could hope in. I would be willing as in in Jemal's game to play either a character or a cohort it is just up to you.
Hmm, there's not much room for a cohort in the opening scene (how many heroes are buried with their sidekicks? [actually more than you'd expect

]), but I can easily work you into the plot.
However, doing that or adding another character would mean I'd have nine (!!) players, and I want to keep this game moving quickly.
I could split the party into two games, or add an 'opposing' party, but that would practically triple my workload, and I think I'm pretty much edging on my limit right now.
The only other way I can move the game along quickly would mean I would not have time to wait for everyone to post before determining actions. That would make an 'autopilot script' with your character sheet absolutely imperative. You would need prescribed actions to deal with a variety of actions besides combat, as well.
If it were me, I'd suggest that the subervsion could be done like this:
Greater Subversion: As subversion but the liberator can do it in half the time and it effects any level of charm or compulsion.
This would probably be best at every seven levels and maybe greater could give a Charisma mod x 1.5 bonus to another save or an extra chance to save if the target fails the first OR automatically break charms/compulsions of a certain level or less...
Just some things to think about..
How about an epic feat?
Greater Subversion [Epic]
You are especially adept at breaking enchantments and dispelling compulsions.
Prerequisites: Charisma 19+, subversion class feature
Benefit: You may attempt a subversion effect as a standard action. In addition, the minimum conversation time is reduced to ten rounds. You may do other things that do not require speaking, including casting spells without a verbal component, but if you attack or perform an action the target perceives as an attack, the subversion is broken and you must start over.
Normal: You must spend five minutes in conversation, and the final effect takes a full-round action.
Also add "Familiar Spell" to the list of bonus feats for Holy Liberator for your celestial companion.
Just so you know, semi-permanent enhancement magic items qualify towards ability scores. If you lose them, you also lose the feat.