change key shortcuts in LRc

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"“create a radial gradient” from CMD+ to Shift+M"

The default keyboard shortcut for the menu command Tools > Create New Mask > Radial Gradient is already Shift M, when running LR in both English and French.

Did you mean that you want to change the shortcut for Radial Gradient from Shift M to Cmd M? That works using Mac's System Settings on my LR 14.2 / Mac OS 15.2:

After making that change, it shows up in LR's menu Tools > Create New Mask > Radial Gradient:

If this doesn't help, please describe precisely what you've done with System Settings and Radial Gradient and what you're observing.