Variation on the stated ideas:
I add to the album title an extra classifying term if necessary to make the title unique: [British], [MONO], etc. Of course this messes up album cover lookup, so I do that first. Or I temporarily change just one track, locate the cover art for that track, then copy+paste it into all tracks. OR (usually) I get the cover art some other way (very few of my albums seem to be in MC's database).
Even more important in my library is to handle variations in TRACKS of the same song name and artist. Some performers did the same song several times, or there are different mixes of even the same session (Beatles are notoriously different mono vs. stereo), different edits, etc. I don't want to alter the song name because it won't group properly "by Name". So I added a separate field just below Name (RecVer). It's normally blank, but when necessary it has a terse term to identify the particular recording version (RecVer). It might be VER1988 to distinguish from VER1991, or STUDIO vs. LIVE. Or VER1 vs. VER2. Or ALT. Or a BRITISH. Or MONO vs. STEREO. Or MIX1 vs. MIX2. Or whatever.
Then -- final piece -- the track file naming expression adds RecVer (if non-blank) to the end of the file name, prefixed by a tilde, so I have a locked-down, controlled file name (rather than let MC assign (1), (2), etc, which isn't stable).
So I might end up with multiple tracks of same artist, same song, different RecVer, that the expression names like this:
beatles - help ~mono.flac
beatles - help ~stereo.flac
beatles - help ~movie.flac
etc.
(Regardless of capitalization in tags, I force all file names to lowercase to avoid problems with different platforms and operating systems.)