Latest version of C# is a fantastic choice for this. Java too but I would lean more C# due to the new delegate function pointers for source-generated p/invoke. Thing of beauty.
I also want to call out CppAst [0] and CppAst.CodeGen [1] projects. These two things have saved me years of my life if I were to roll these by hand. Kudos Alexandre Mutel, kudos.
[0] https://github.com/xoofx/CppAst.NET
[1] https://github.com/xoofx/CppAst.CodeGen