C# Generated code results in unusable variables

[churstz]

I'm working with a vendor's swagger in which someone thought it would be great to create parameters representing object hierarchy using semicolons. In short think query string parameters names customer:firstname, customer.lastnname, customer.favcolor. This results in C# code where variables names are rendered as
string customer:firstname,
string customer.lastname,
string customer.favcolor

none of which are valid in C#. The request is to update the code generation for C# variables to replace special characters with something valid like an underscore. Honestly it doesn't matter what the replacement character is as long as the C# variable is the same everywhere.