When it’s an IP where the main character’s DNA is intertwined with the actor who played them…just leave it alone. Shame on Steve Martin for even thinking about playing Clouseau, let alone doing it.
Just re-work the script so that it’s about someone else. They do the reverse all the time.
His son Wyatt (no, really) is a lot like him and I’ve enjoyed his performances. They played young and old versions of the same character in the Apple TV Godzilla show, whatever that was called. I didn’t finish the show but I remember liking Wyatt Russell.