Micarta is going to be difficult on a lockback with no liners like the Lightweight. I don't think there are any decent options out there for scale replacements on these, and some micarta scales probably won't hold up very well over time, due to it interacting with the lock directly. Sorry, I don't have a good idea on scale replacement other than finding a custom scale maker that can make you some out of something like G10. That's probably a lot more effort than it's worth.
You can, however, easily dye the scales because you got the Maxamet version.
Here's a knife with the grey Maxamet scales that I dyed myself. Perhaps you could do something like that with some Rit Dyemore Synthetic.
View attachment 1402864