Would look into good used shafts. Have a pair of turbo shafts off a very low mileage car in my own spare parts pile. No sign of needing them for a while, but they are expensive*
*Expensive when you think a pair of them is about the value of the car, but then will give you 150-200k of happy motoring again.
Think some folk have bought cheaper end of the market/badly reman shafts that are for NA cars and then had on a turbo petrol/diesel and wondered why they've imploded after about 6 months. AFAIk they are the same fitting, just a lot beefier CV's and shaft size.
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