Hi, and sorry for the delay - I was eating dinner.
I don't recommend trying to wire the surround speakers into the terminals for the other speakers. Before we get into that, though, I'd like to see if we can get your wireless working again.
Have you tried to diagnose the issues with the wireless, such as looking at the Troubleshooting section on page 38 of the owner's manual? We might be able to get that up and working again, which would be the best solution.