The only way I could even possibly (and I use that term loosely) working is to run some he341ve ( I think thats what it is, slightly smaller compressor than the 351ve). Make a pair of manifolds to mount the turbos, one on top and the other on bottom, run the exhausts out into one pipe or 2 it really doesnt matter, so really the plumbing would be pretty simple. As for oil feeds and drain thats just like a twins setup so thats easy.
The controlls seem complicated but I think it would be simple. Either call Brayden Fleece and see if he can (I bet he can) setup one of his controllers to run 2 turbos instead of just one. If he cant or wont or doesnt have time to do it the just buy 2 seperate turbo controllers and run them both on the motor as seperate setups, it wouldnt be the best or cleanest way to do it but you could at least get up and running.
I think the he341ve has a 56 mm wheel but I cant say for sure since I have never seen one in person, just internet hearsay.
Either way I dont understand why so many people are hung up on doing parrallel turbos on a diesel, its been done several times and published many times and discussed to death, IT DOESNT WORK GOOD ENOUGH TO PURSUE! Twins work so well and unlike a gasser diesels love lots of boost, I bet if a gasser could run big boost the gasser guys would run them also but they cant so they run parrallel turbos.
With all that said I would like to see how well a set of VGT turbos would do although I still think its not gonna work like you would want it to.