Not possible As far as I know. What are you looking to accomplish by embedding two profiles in one image?
It is possible to embed the color effects of one profile into another with Colorthink Pro's ColorCast...useful for softproofing n-channel profiles within Photoshop, which doesn't support n-channel profiles (without a plugin).
Edited by: Michael Eddington on Sep 12, 2007 7:53 AM
Well, perhaps it is possible for certain file formats to contain more than one profile...from the ICC spec...
"A IC device profile is embedded, in its entirety, as a single TIFF field or
Image File Directory (IFD) entry in the IFD containing the corresponding image
data. An IFD should contain no more than one embedded profile. A TIFF file may
contain more than one image, and so, more than one IFD. Each IFD may have its
own embedded profile. Note, however, that Baseline TIFF readers are not
required to read any IFDs beyond the first one."
So maybe its technically possible, but not for practical purposes from a user perspective. You might want to ask this question at the Colorsync users mailing list and see what kind of response you get.