Instead of psion 35, try psion 21/wilder 4/anarchic initiate 10. You get more powers known, more power points, and (with Practiced Manifester and a few boosters here and there (and factotum so you can ignore SR), you should be able to keep up well enough (especially since you can use epic psionics - identical to epic spellcasting - so just use lots of Psicraft DC reducers and you should be good).
Unless his DM rules otherwise, you can only get PRC's on one side.
Well, psion 35 just seems like a waste of class levels. Sure, you get the manifester level up there, but you don't gain any extra powers known, no additional power points, and you don't get epic psionics any better for more psion levels.
You get bonus epic feats. Besides, you get enough goodies from the other side. Isn't Factotum11/Wiz1/SwiftBlade9/CC1/Cru1/RKV7/Whatever5 enough for anyone? (Alas, I couldn't find away to get Divine Oracle 10 in there, unless I dump the wizard level, but that has problems all it's own)
Okay, practiced manifester and dump 3 levels of Psion for Racial HD/LA? What race would be good?
Tiefling has good stat adjustments, and so does Drow (though LA +2 is so not worth it without buyoff)
Alternatively, human paragon for the +2 stat boost.
Oh, and this epic feat allows more action abuse:
Multispell [Epic]
Prerequisites
Quicken Spell, ability to cast 9th-level arcane or divine spells.
Benefit
You may cast one additional quickened spell in a round.
Special
You can gain this feat multiple times. Its effects stack.