Only you and Lucas have tested it. Sending emails back and forth to each other agreeing on a change doesn't;t magically make it happen.
I didn't add the metrics changes to the PR because the PR is about bringing the font in first (in my mind). The metrics can be in a different branch. If I put all of them together, it makes it much harder to be able to decide "we want the font changes, but not the metrics changes yet". As I've mentioned before, many times now, I personally do not have all the knowledge to know if the tweak to the tcl from extended, in fact, is only thing that's needed.
That's not to say the extended stuff CANT be brought in, just that, in software that lots of people rely on, it pays to be conservative in making changes like this. It may work for *your* help patches but may break tons of *other* patches for other people. I dunno, which is why I am cautious. We need feedback from others and the "powers that be."