Hello Nik,
Thanks for responding. You must be very busy right now.
Preferabele on (batch) saving or (batch) export. So I guess in the regular (browse) view. But would be fine in the Exiftool if that is more simple to achieve.
(You probably know Affinity photo, I like te way the managed this, chose the tab mtd make the changes and save. You can import a save xml-files to apply depending for the applicable purposes).