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Would something like this work:
http://www.amazon.com/Leviton-5059-15-Amp-3-Wire-Receptacle/dp/B000U3I1Z8?tag=viglink20246-20
That seems to already have the outlet. If what I linked will work, do you know if I would need anything else or if the wires all connect to the back of it and I just screw it on?
I didn't see anything in a casual search. But you could make something work. I think the screw pitch is the same for round and octagon boxes (3.5")
1) Single round outlet cover:https://www.amazon.com/Leviton-5059-15-Amp-3-Wire-Receptacle/dp/B000U3I1Z8
2) Drill a hold in the center of a blank plate to match the round outlet. https://www.amazon.com/Taymac-LPB3325-Standard-Metallic-Wallplate/dp/B008KNYUAA
The solution here is to swap the keyless socket out for an outlet.
There are three choices: