It may be a bit of a drive and I don't know if they have one, but North American Flight Academy at DTO used to have a Seneca, N15789. I see that N15789 is now registered to someone in MO, but perhaps NAFA has another Seneca.
There's not a Seneca at GPM. I think you're thinking of a Duchess. For some reason the Indian gov't accepts that over the Seminole. The Duchess is also privately owned and not part of any flight school.