There was a company in Cumbria, or that way that did a kit, unsure of name.
Engine has oil squirters for the back of the bores, swapping to AAZ pistons rather than the 1Y ones it shares with the 1.9 may be a prudent move too.
Pump top should swap accross from another model to gain a LDA.
I'm fairly sure a turbo and manifold etc from a 2.5TDI would work.
This is speculation by the way, never done but no reason why it won't work.