> The meter (m) is defined by taking the fixed numerical value of the speed of light in vacuum c to be 299,792,458 when expressed in the unit m s−1, where the second is defined in terms of ∆νCs.[0]

Your proposed change is keeping this the exact same but changing 299,792,458 to 300,000,000?

You said: “I wish it had been defined in relation to the speed of light in a vacuum.”

I believe it is already, as written above.

0: https://www.nist.gov/pml/owm/si-units-length#:~:text=The%20m....