Fitting a turbocharger to a diesel engine isn't a huge issue, particularly if you use a Dawes/Tillix valve for a vaned turbo, or just pop in a waste-gate turbo (simpler). You might want someone to change the fuel map so that it's richer (the turbo will lean out the fuel/air mix particularly at higher boost levels). You might even be able to achieve this with an aftermarket chip.
It's not like fitting a turbo to a petrol car or something like a Tesla, which is nearly impossible.