Need to charge a larger initial fee plus monthly lower fee

We want to offer a site-building service that will cost an initial fee of 1500 $ + 40 $ the following months for hosting and support. We are setup with MS WP + ProSite + Membership and many other plugins.

In all our research on your site, we did not find a way to charge a larger initial fee plus monthly lower fee using either ProSite or Membership. We are assuming that it is impossible to do so - but please correct me if this is not true.

One alternative we found is to redirect the prospect directly to a Paypal button we create - outside of the WP. Once the client has paid, is there a way (a plug-in) that will 1) register the client as a member on our WP main site, and 2) if possible, setup this member to a specific ProSite and/or Membership level.

Also, if the member cancels his paypal subscription, is there a way to disable the member site.

Thanks