Can I create my own paypal buttons for Pro site levels?

Ive been reading on the forums about customising the level tables that ProSites create and its not very customisable, however Im thinking what about creating my custom pricing table and add paypal buttons that are configured each to each level. Since its lines of code that is added to the paypal button, and the IPN etc to add people to each level, I wanted to ask if this is possible and if theres a workaround this.
Maybe even add it as a suggestion since it will allow to have custom buttons wherever we want on our sites to promote upgrade to another level.

Thanks for your help