I can state with reasonable confidence that there is no feat or item that will accomplish this. I can state with some surety that no class will do it either, though that is a more difficult statement since there are so many.
A better method would be to extend your reach. As a psionic character, you could pick up the expansion power to increase in size, gaining more reach. You could take the Aberration Blood and Inhuman Reach feats (Lords of Madness), or the Willing Deformity and Deformity (Tall) feats (Heroes of Horror), gaining 5 ft. reach for either combination. Or all of the above, gaining 15-20 ft. worth of reach.
Alternatively, you could talk to your DM about porting some options available for psionic powers over to this supernatural ability.
For example, there is a Reach Power metapsionic feat, which requires Enlarge Power. There is an Enlarge Supernatural Ability feat (Tome of Magic), so you could make that a requirement for a homebrew Reach Supernatural Ability feat, allowing a touch attack to be made at range (30 ft. is typical) once per day per time you take the feat.
Another option might be a way to allow a psicrystal to perform supernatural touch attacks, much as it can perform psionic touch attacks.
Or a way to channel a supernatural touch through a ranged weapon, making it no longer a touch attack but allowing you to try to apply the touch at range.