You can code the W-2 to the nonresident state without adding that state in the client info screen.  Check multistate return in client info, but don't add a state in the popup. Then code the W-2 as US to the right of the wage numbers, and use the correct state in the E-filing (W-2 State / Local) section). Be sure any state withholding isn't coded to the resident state.

I find it's more cost effective just to REP the state and file the return (and charge the client for it) than it is to fiddle with workarounds.