I want to add an active magic effect containing a script to run constantly on the player, from the game start.

What's the best way to do this and at the same time keep good compatibility with other mods?

For example, I know I could simply create a perk the adds a constant ability, and then add this perk directly to the player race. But I believe doing this would be risky, breaking compatibility with any other mod that also overrides player races.

So, any other nice way to add such constant script?

Maybe using a quest? Maybe finding an existing perk that can more safely be modified to add my ability?

Creating an alias for the player would probably do the trick.