In realtime, there is always one stereo stream to and from Performer.
You can control this stream from within Cubase/Nuendo using the “RECORD” controls on top of the Performer monitor (level, pan, fx).
So no, you cannot acheive what you want, because there are only two channels sent at any time. You would need 3 channels.
You might try some trickery with hard-panning left/right, and record 2 mono channels from the input. Don’t know if that works but I guess it should.
In any case, the PRO version can record up to 16 tracks on the performer computer and transfer later. Even then, the realtime stream is always stereo and RECORD controls what is beeing sent to the stereo mix. But local Performer recording is always directly from the input, so you could omit the dry signal from the stereo stream and record it nevertheless.