Just a question: but are you considering the frequency of usage for a particular symbol in that suggestion? If {} is for opening/closing functions or code blocks/scope AND [] is for making arrays, lists, or some other data structure: do you only want them switched where, idiomatically, where there are less function definitions vs instances of the data structure? Or is it an overall objection to any shift+key operator in a basic syntax?

I don't code in C/C++.

Consider remapping your keyboard layout