The checkbox/radio button scenario that you're describing is a bit outside of the range of functionality for this particular plugin, but it's definitely an interaction that you could create by using the MailChimp API.
While we don't provide support on API code here in this forum, I'd be happy to provide a few links to some resources that can help you get started in implementing this.
I'd recommend checking out our API documentation here:
And for code examples, check out the API wrappers that are available here:
If you have any API-specific questions, you can refer to the "Support" section in the API documentation, which should link you to an available MailChimp API Google Group. Make sure to use the search bar at the top of the Google Group to ensure that your questions haven't already been answered. If not, feel free to post your question there and one of our developers should get back to you.
If you have any questions, let me know!