I do not know if the Peachtree Nova has a HT Bypass input but that is the best way to integrate your two goals.
If it does, get a decent modern AVR with L/R line level outputs. That way the main speakers function as L/R for the HT operations and there is no complication with split VCs.
If it does, get a decent modern AVR with L/R line level outputs. That way the main speakers function as L/R for the HT operations and there is no complication with split VCs.