I'm not a big fan of those supports they are a band aide. The ones I've seen weeped coolant through the threads. I would also like to see what the bore does at temp it wouldn't surprise me if the bore goes egg shaped with the way they push on the side.
So correct me if I'm wrong. It has variable cam timing, and the pcm keeps track of it by the reluctor on each cam. So the cam timing changes maybe 1-2 degrees throughout the rpm range because of the tensioner. The phasers are constantly adjusting for it by what the reluctor feeds back to the pcm.
It won't be cost effective. I own a machine shop, and wanted to do my own. I have more in tooling to do the job than it would have cost to have it done. As for the mt82 I'm leaving it in my car, and I'm shooting for over 1k. So far I've bought 3 of them to have in rotation as they break.