Change Upfront's Text Without Changing The Theme's Functions

Hello.

I would like to change the Upfront link to start the editor. I know how to do it making a change to Upfront's functions file, however those changes will be lost with every update.

Is there any way to change that Text using a MU-Plugin or something similar, that will not be affected with the theme's updates?

I dont know if ultimate Branding would do, since I think that will change all the "Upfront" words and I just want to change that specific link.

Thank you!