I have a 1.9TD in my mkI and had the same problem with the fuel filter stand assembly interfering with my turbo intake hose. I pulled it out of there and put in an early mkII fuel filter can (w/o the fuel return widget) in place immediately ahead of the shock tower like a mkII. There is no mounting for it there, so I took a standard angle bracket (3" or something) and chopped one leg down to size so it bolts on top of the that stud ahead of the strut bearing with a second nut. The long leg of the bracket points down the front of the strut tower and the filter attaches to this with a wide hose clamp. I also needed a short hose extension for the fuel supply to reach this new filter location. The return hose in unaltered.That worked for me as I don't have a bulky airbox there but rather a stupid oiled cone filter (I judged the stock 1.6TD airbox isn't large enough for the 1.9).Brendan.
i too have my filter in front of the shock tower. but instead of going up over the engine with the air intake, i just cut a hole in the rain tray. the air filter sits right next to the passenger side hood hinge. and plus, it sucks cold air from the cowl instead of the engine room. honestly i like how clean it looks.