You can purchase a P5043 directly from Intermatic if you call them. You have to be running firmware version 3.4 to use it. I upgraded to 3.4, but am still working through issues from that, so I can't comment on how well the 5043 works. They did tell me that they have been working closely with MiCasaVerde and would be releasing version 3.5 "soon" with much better control. We will see.
After upgrading from 3.1 to 3.4, I haven't been able to get the PE953 to work. I decided to go ahead and make Vera the primary controller since the 953 handheld wouldn't work anyway, and Vera can now control the 5 primary circuits, but she can't control my Pentair variable speed pump. I was able to control that from the 953 with version 3.1, so that is a bit frustrating, but I'm hopeful I can fix it. I never connected the PE653 to Vera when it was running 3.1, so this is a new challenge for me and I know there is a lot of info on this forum, so I will keep searching for tips and hoping for a solution.