GOOD NEWS EVERYONE!
From my limited testing, it seems to work at least partially with GWX 3.
Caveats:
-only HE deck gun ammo is selectable
-loading screens are those from SH3RNC
-torpedo and shell graphics are also from SH3RNC
-very quiet engine sounds, not sure if this is a glitch or standard operation
-no orange marker
-haven't tested it yet, but GWX-specific strings will most likely not appear
I will be conducting further testing and will probably release a compatibility patch.