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Well subtracting the hum requires knowing the hum at that time, right?

Wouldn't something like Nvidia's noise cancellation tech (as commonly used by podcasters, etc) remove the original hum well enough?

eg ready for new "fake continuos hum" to then be applied

Yes,*and* its harmonics, which would have to be replaced as well if they're detectably present. Swapping hums isn't trivial.

If the goal is just to obfuscate the hum, couldn’t you just scramble it instead of “subtracting”? Especially if you’re not trying to replace the hum