A customer asked me a question the other day about how to increase the font size of the actual radio button itself. I asked Saurabh to answer the question, and he posted his response on his blog.
Saurabh calls out how this leads to an inconsistency between the application having large radio button fonts and the platform having smaller radio buttons. It is more important for the application to be consistent with itself than anything else. If you want to support large font radio buttons, you need to make sure that all radio buttons, checkboxes, etc support it. You can’t change the platform, but you can at least make everything within your application consistent.