Is it possible to provide a list of allowed templates depending on a given key value ?

Hi,

Yes, this is possible using template arguments.

1. Create your generic template, and use a Template List Provider where you need flexibility.
2. Create a template or provider reference argument on your generic template
3. Pass the template argument to the Template List Provider value holder inside your template
4. Create a specific template for your specific case, which only needs to act as a wrapper for your generic template. 
5. Pass a provider or template configured for your specific situation to the generic template as an argument

HTH,

Jostein