I found something cool 
It seems don’t actually have to scan c++ files with the localization dashboard. All my texts are present only in string tables which i do scan
Even if I don’t reference a string table entry anywhere, it will show up in exported po files and it will compile into the locres, archive and manifest files. Looks just fine.
Probably there are other cases where the macro is still required then. Ofc I’d need to scan source for NSLOCTEXT if they were not already in string tables.