I would like to point out that diesel technology is widespread. There are a LOT of industrial diesel applications. In rural areas, find out who the farmers are taking their tractors too. Big trucks are everywhere, so are the shops that fix them. On the coast? Check out marine mechanics; fishing boats, trawlers, tugs, are running all kinds of diesel motors. Look for who is supplying those backup generators to hospitals.
These forums are automobile oriented, think outside the box. If the local diesel shop can't do the work, they should be able to help you at least find, or recommend, the appropriate person/business who can clean, test, and balance your VW injectors.
My $.02,
R*2