Taking Place Of Wp-Signup with Form On Website Using Prosites

Hello,

I was wondering if it would be possible if I had a programmer build a signup form like edu blogs where they can pick their initial plan and everything is automated using Prosites. Is there any issues with doing so? I know edu blogs have a more custom solution.

Basically my solution is for dentists only and would like them to set everything up on a custom form that matches the website. Would it be possible to replace the wp-signup form with a custom one and have them pick the right plan from the get go and start a free trial?

Before I hire someone I want to make sure what I am wanting to do is possible.

http://edublogs.org/signup/

Thank you!