How can I turn off git bash for Windows case-insensitive behavior?

I use the Git Bash on Windows for numerous bash tasks exceeding the Git use. It works well over years, but I cannot turn of the case-insensitive behavior. Auto-complete is cumbersome this way.

I tried the flag

shopt -u nocasematch

in the .bashrc as described in solution #3 but it does not resolve the issue.

Neither solution #1 or #2 are an option for what I am looking for, as I have aliases uppercase, directories mixed cases and some files all lowercase and it is too many cases to apply a case-map.

Is there any way to enable case-sensitive autocomplete in my non-default Linux shell?

Since it is a different flavor, I would appreciate some hints or suggestions.