No, that's stupid. Once the item is activated to cast it, it's done, it's in effect. Have fun. Go murder some psions, champ.
It doesn't need to be permanent. You just buy or have some one make an item that casts the power at probably minimum manifester level for that power; 13th. Probably once a day for cheapness sake.
It'd be like......(6x13) x 2,000 divided by (5 divided by charges per day[1])
156,000 / 5 = 31, 200 gp to buy. If your friendly party psion knows how to craft psionic items and knows the power, you can cut that in half.
You'll also need to pick a body slot for the woundrous item to fit into. I'd vote Head or Face because psionics makes sense somewhere up there.
Edit: By the way, considering you said you were 6th level, I am assuming the party Psion is also level 6?
If so, a DC 23 on a 1st level power (Mind Thrust) is very, very hard to believe and he might be doing something wrong. Or cheating. Whatever.
Assuming the Psion is 6th level like you are, the most power points he could augment a power with is equal to his manifester level, which would be 6 assumedly. Every 2 points spent on Mind Thrust after the initial 1 to manifest it at all increases the DC by 1, so capped at 6 additional points beyond the first he could instead the DC by 3 at most at his 6th level. With a 1st level power, that puts his base DC at 14 if he spends all 7 power points to do so. That means he'd have to have a +9 modifier on his Int score. His Int would have to be a minimum of 28.
I just find that hard to believe IF the mentioned Psion in your party is the same level as you.
(And then after I typed all that I realized you said you were a Tiefling too, which is a LA race, so you'd be 7th at least, so the Psion could be assumed to be at least the same level as you; 7. But that still doesn't give enough room for another DC boost with further payment of power points.)
ALTERNATIVELY you just remembered the name of the power wrong and it's something higher level than Mind Thrust being used and this is all moot