Latent Psychic, Won't "Ping" on Psidar

[Phantasm]

I'm wrestling with an issue.

I've got a character who is a latent psychokinetic; he only has the power modifier on one trait - Imbue - and that's basically an unconscious use of TK to perform the Imbuement skills.

One aspect of the character is that he registers as a non-psi to anyone using Psidar abilities or psi-detection technology. He's completely unaware that he is a psi, and in fact believes he is just a normal schmo whose talents are just Talent and training.

I looked at Obscure (Stealthy; Always On; Reduced Range) for this, but Powers makes it pretty clear that it's always an area effect.

The Psi Latency Perk in Psionic Powers also seems viable, except the wording of the Perk indicates that adding a power modifier to even a single ability is out of the question.

Any thoughts on how to model this?