I'm not saying to splice any wiring. The wiring for the Civic and RSX should be the same since they run mostly the same engine and have mostly the same wiring to begin with. If the plugs are the same, then so are all the connections and all the wires. It should work fine, just like from the factory.
To put an end to the initial question, the EP3 probably will not work becuase your RSX is too new. They updated the RSX a bit in 2005 to go with the new Civic (probably to streamline production and cut some cost in parts for the two), so I think it is closer to the newest Civic Si. Stick it out and try to find a JDM RSX wheel. It'll make life a lot easier.
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