In my experience this will be nearly impossible.

For DIYer I'd recommend going with an OM648 powered vehicle. Much easier to work on. At some point you'll be removing the intake manifold to replace the inlet port motor and free up the linkage (very common after 100K). A competent DIYer can handle this job with no problem.

If you go with an OM642 powered vehicle the intake will be coming off as well, but this time to replace the oil cooler. I would advise against trying this at home! Good luck