Are you using—and populating—the sort album artist only for these non-English artist names, or do you have album artist and sort album artist next to each other intentionally for all artists?
I feel it is safe to assume that it's the first.
In that case you can create a virtual tag using this formula:
$If(<Album Artist>=<Sort Album Artist>,<Album Artist>,<Album Artist>" - "<Sort Album Artist>)
Name the tag to your liking (e.g. Album Artist Extended), and select that one for displaying instead of Album Artist and Sort Album Artist.
The reason I asked is that I would suggest not to use Sort Album Artist for this purpose but create a dedicated custom tag for it.
It's usually a good idea to use tags for what they are intended for.
Even if you don't use them now as such, it might bite you in the butt later if you change or enhance your workflow or system.