Practically speaking, (even given the anecdotal about the utility guy who gladly installs the user-constructed skirt, or successfully taking people to court), for most people the answer boils down to "there's little you can do to the light itself". Not to say the others don't happen, just that for most of us, it usually turns out to be a case of wishes-were-horses-rather-than-riding.
That leaves an obvious alternative, although since you're in an HOA, you'll probably need to make it purdy, and almost certainly it'll need to be able to quickly assemble and disassemble for one-night-at-a-time temporary use as a true portable tool.
Build a light shield. Benefit is that if you do it right, you also get some beneficial ground-level wind protection that can increase your productive time behind the telescope beyond that of calm nights. You'll have to hunt around a little for images/ideas (or purchasables), but I doubt it'll be a difficult search, at least for DIY. Try here on CN and a wider scale google/et al search Some will probably (HOA) be a no-go because they require semi-permanent installation, but many others though are designed for quick garage insertion/extraction...
Worst case, if its strictly verbotten by the HOA, or working out of a portable box offends your sensibilities, at least you can make a two post "flag" blocker that can be put into the ground easily (and removed easily, or some other suspended "banner" to block the direct path(s) to the telescopes' ?umbra? and so kill at least the direct "threat(s).
PS> if 'flagged', place them at a reasonable distance to allow a wider umbrella affect on your working area.
If you can't drive anything into the ground, a couple of sand filled 5 gallon plastic pails would work ~pretty well for a modest two pole "flag blocker" (for putting the flag poles in) and be pretty easy to get in and out of the garage
Edited by xiando, 23 June 2018 - 01:00 PM.