Key-Value

I'm quite sure I don't understand your actual problem here, so I'm only going to focus on the technical part;

1. Create a value list (key/value) provider. The key is the value you want to display, the value is the value you want to select.
2. Create a code template with one value holder, cardinality Single argument, type string. Add a placeholder for the value holder to the display version.
3. Create a code template with a value holder whose provider/type is the value list provider you just created, and a second value holder whose provider/type is the code template from step 2.
4. In the arguments for the second value holder, add a dynamic override from the first value holder.
5. Instantiate & play 

HTH,

Jostein