Customer statements - How to have system select specific custom statement format

We have a requirement to produce customer statements in one of three possible languages (i.e., French, German, or Italian) for a particular country. Our developers are creating the different statement layouts as custom templates with the appropriately translated column headers, etc. We currently use several country-specific custom statement formats that are generated using the customer's default country as the input parameter for determing which statement to produce. All of our currently developed custom statement formats apply to a single country, allowing us to use that data element as the determining factor. This is our first situation involving multiple formats for