Question: What to do with the nut when going to heavier gauge and back?

A while ago I was learning a song in D standard and I decided to change the gauge of my Majesty RP from .10 to .11. Everything was going well until I noticed that the 5th string was too wide for the nut slot so I aborted and changed back to .10.

Now I’m learning a song in drop C and I really miss the tension I got in standard .10 so I want to try to go to heavier gauge again. I understand that if the nut slot is too narrow it needs to be widened with a file, but would that mean that I will have problems when going back to standard tuning with .10? What can I do in that case?

Thanks