Where to put something that can be retrieved from pluginManager and configuration

I’m not entirely sure I understand. What I understand is:

1. There’s a Groovy script which selects between (1) normal resolution and (2) some custom resolutionStrategy.
2. This script is downloaded from some URL, which must be updated when changing the script.
3. You want a way to select which script is used on each project, while avoiding breaking functionality.
4. Your suggested solution is:

So I figured that I would like to be able to select certain version of a dependency while on others they should just use the latest integration.

At this point I think I lost you a bit. Are you trying to solve the problem of distributing the script? Or do you want to find a different solution, which will replace the script?