How about an on/off switch on the porch light fixture? I had this in my old trailer. It was an RV grade 12V
DC fixture with a small on/off rocker switch.
Or if you are handy, drill a small hole in the porch fixture and install a little on/off switch. This is probably more of a direct solution rather than trying to find an oval shaped RV fixture with a switch.
Then you can just leave the wires alone and change one fixture or wire in the switch to the 2 wires that go into the porch light. You would still have access to having them all on or turn off the porch light and have the awning and handle lit up.