Admiral Grace Hopper said, “If it’s a good idea, go ahead and do it. It is much easier to apologize than it is to get permission.”
This of course depends on what you are about to do but in many cases you should just do it.
Worrying about reprisal has halted many amazing careers and lives. If you do something and it works you might have to say, “Sorry I just had to prove this worked. We won the battle.”
What can they do. You’ve won! Do what you want to do if it is a good idea.