Ca we change the datatype of a standard Compensation field

Hello,

I have a standard compensation field currently defined with the "character" data type.
For sorting and ordering purposes, I would like to know if it's possible to change this data type to a number.
If changing the data type isn't feasible, would it be possible to use a Fast Formula to override it ?

From what I’ve checked, it seems that changing the data type might not be allowed, but I’d appreciate a second confirmation to be sure.

Thank you in advance for your help !
Sara