Different Image Libraries Based on Country

I have a need to use different images based on a country chosen.

I have been able to make it work using a large, nested and tiresome rule and wondered if there was a more elegant way.

Basically I'd like the user to choose a country from a drop-down. Based on the country chosen, some images would then be available, whilst the balance of the library would not be available.

Any idea if this is possible?

Would something along the lines of this work:

//custom path to correct folder for each country
// this line could be put in OnRecordStart callback rule to apply to multiple
// image rules if necessary
var path = "jobs/Projects/Postcard/Countries/" + Field("Country") + "/";

// chosen image pulled from correct sub-directory
var image = CreateResource(path + Field("Picture") + ".jpg","graphic",true);

return image;