There’s a way to disable the shortcuts so they can be remapped: https://github.com/midrare/hyperenable
It basically runs and creates the same global hotkeys as explorer.exe would for those Office ones, but it does so right before explorer launches so it can’t assign them anymore. After that, the program disables them so you’re free to use the hotkeys for other programs.
Your warranty is now void. I am not responsible for bricked devices, flat tires, an empty fuel tank, or you getting fired because the fart app goes off at random. Please do some research if you have any concerns about features included in this ROM before flashing it! YOU are choosing to make these modifications, and if you point the finger at me for messing up your device, I will laugh at you.