How to invert the ultra key effect in adobe premiere?

Hi,
I'm trying to do a green screen shoot, except instead of replacing the background, I'd like to replace the person in the shot. I'd like to do this without greening the person. I have tried using the Ultra key effect and applying the invert effect on the alpha channel. But that gives a lot of noise, I want the "green screen part" to be totally black and the person replaced with another video or image. Is there an easy way to do this?
Thanks

So you had the ultra keys output set to alphachannel, the dublicated clip in track bellow with same ultra key plus track-matte-key with the track above as input, compositiong with set to luma matte and inverted. (or directly apply the track matte to the footage which should appear in the silouette)
If your settings is like this, what do the ultra key adjustments look like? with light and shaddow set to 0 and tolerance and last value set to 100 i get very low noise and a clear outline.

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