Maybe a stupid idea but can't you write to Susanna so she can give you name of scholars in Western Armenian?
She is not herself a third-party (and not a scholar in Armenian AFAIK) but she can probably provide the name a third-party.

Cheers, ~nicolas

PS: Oliver you link doesn't work, I've got an error 404 and I don't see "Western Armenian" in https://linguistlist.org/people/personal/browse-sc.cfm?SearchType=SL just "Armenian", "Amernian, Classical", "Armenian, Middle"