Unicomp (makers of the IBM Buckling Spring keyboards these days) has the EnduraPro, a buckling spring keyboard with a built-in trackpoint.

https://www.pckeyboard.com/mm5/merchant.mvc?Screen=CTGY&Cate...

But that page says 'sorry one of our parts suppliers went belly up and we're trying to find a new one' so you can't buy a new one today.