no, that would not be a problem as soon as the other image library has an api reitti could query. It just happens that I am settled with immich and had no other needs at the moment.
If you need a specific one, drop a feature request and I will have a look.
If you use Photon and only have your main country available, it will fallback to the configured external Geo-coding-services since Photon will not return a result then. So the order of execution is: