There have been a few more youtube videos concerning the timing chain issue that have popped online in the last 3 to 4 months.
There's a series here:
https://www.youtube.com/channel/UCfdm97PbaUJAo8Q_Wd3ErcA
The uploader there (who may post on this forum?) did the job himself and just gives video updates along the way. It's interesting to note that, although he heard a knocking sound before the job, he didn't notice any discernible difference between his old chain and new chain, and it didn't seem like his old chain had worn or stretched at all. In the last post in his series, he opines that he only really needed to change the guides and the tensioners, but to do that you have to remove the front timing chain cover, and to remove the timing chain cover you have to remove the heads. Once you do that, the chain is right there and you might as well change it, too.
Removal of the heads appears to be the biggest PITA of the job, as it also requires removing the injectors, fuel rails, and a bunch of other stuff.
However, one commenter in the last video stated that it's possible to remove the timing chain cover by slightly flexing the valve covers (and not removing them). Which is something this RR owner did:
So, in light of all that, would it be possible to just replace the guides and tensioners as preventative maintenance, thus eliminating a bunch of painful steps? One key issue is to make sure the timing chain doesn't skip any teeth, but, so long as you can do that, the job looks a hell of a lot easier.