As you have already concluded, Picture Controls (on raw files) are not recognised by Aperture, but the intent of Picture Controls can still be achieved.
Consider whatPicture Controls do: they are, in effect, a set of preset instructions attached to the raw file in-camera, and modify the raw file though addition or subtraction of contrast, saturation brightness etc etc (see link below:
You can (pretty much) replicate these in Aperture through the use of presets. I recall Rob Boyer some time ago posted either on his website or in this forum his results of attempting to match some of the Picture Control settings with customised Aperture presets, and I think he got very close.
Is there a particular effect or look that you're after with the Picture Controls?
I think you are still missing the point - the ONLY advantage to in camera settings is that someone at Canon or Nikon sat down and said something to the effect of, "Photographers routinely make these edits, so I'll build them into the camera." Convenient, but nothing that you can't replicate in Aperture, Lightroom, Photoshop, GIMP, or whatever.
While I actually dislike the look intensely, I would guess that the effect in the photos you linked is mostly a drop in saturation and maybe a kick up in contrast.
I agree that it is nice that Nikon offers things like Portrait, Vivid, etc., but one of the reasons I shoot RAW is so that I am NOT locked in as I would be with an out of camera JPEG that had already been de-saturated, sharpened, or whatever.
Scholars differ on this, but I would suggest that what you really want to do is learn the editing formulae to achieve any effect you want.
You can't really use Capture NX as an external editor as it is also a RAW developer. If you want to use Capture NX, either:
-- Run your images through Capture NX first and then import the TIFF into Aperture, or,
-- Take a look at Catapult: http://brushedpixel.com/