Nope, it will be always be an IDI without tons of money and custom parts. You can bolt on an aaz head that has bigger valves than 1.6 head and it is a big upgrade. Also, send your pump out to Giles or Dieselmakken and get a bigger pump to do work. No real better intake or exhaust manifolds out there off other models or the shelf, you would have to make your own. Turbos are hard to recommend as everyone wants something different, but from all I have seen the Holset and Mitsubishi turbos are built way better than the rest. VNT are good from newer vw, but need a control system.
I wasn't aware that TT made a diesel cam?