just throwing this out there... whats the harm in spending 20 minutes, bolting the manual flywheel to the 0m617 in whatever position you feel is the best, and firing the engine up.

if you dont get any vibrations, then just go for it and save yourself 100$ at a machine shop and all the time and headache involved there.

the only experience i have with this is a good friend of mine who does crazy mercedes diesel swaps (such as an 0m617 turbo in a 450slc, 617 turbo in a 280E, and many more)
anyway he told me he has never had a flywheel nuetral ballanced and ha always is able to get it. he said, if it vibrates, unbolt it and rotate it 180 degrees, if theres still vibration, rotate it 90 degrees, and so on working down in halves of the previous rotation.

aanyway thats just my .02$ and some advice from an old fart whos been doing it a while