Very helpful indeed! Thank you.
One possible correction:
This may have been implied, but I forgot to state that I have actually used the low-profile angled valve stems in the past (as opposed to merely having ordered them, for my latest acquisition). The most recent personal use was on the 2007 650 Exec that I owned from 2007 - 2012. Not having seen that bike for five years, I was just looking at some photos of it, trying to see if I had taken one of the valve stems.
I came across only one, and it was of the rear wheel:
Note that it is pointing to the left, not the right.
I just stooped way down low, and looked around the 2008 Exec. Keep in mind that I got this bike only a few months ago, shortly before riding season was over here, and I haven't worked on it much.
In any case, with the disk rotor and caliper on the right back there, and the final drive and ABS ring on the left, it does look as if there's a tad more room to work with pumps, hoses, gauges, and suchlike on the left -- on this particular model.
So when I wrote in the prior post ...
Everyone I know with bikes prefers the opening to point to the right side of a bike. (And the standard for "right" and "left" are as someone is sitting on a bike.) This makes the valve opening more available when a bike is on the sidestand.
... how about we chalk that up to a senior moment?
My point about specifying to a tire shop which way you want them pointed still holds, of course, but that specification is subject to change, by you.