In our universe I don't see a lot of advantage they could have. However, in the dark era of the 41th millenium why not....
They would be the perfect inquisitorial shock troops to fight daemons and creatures of chaos. Just give them something like a vox-com, saying in their ears at any time that they are the children of the God Emperor and must destroy the daemons and kill the heretics.
Good point, these guys just couldn't be corrupted by sects and cultists. Also they would almost immediately forget every encounter with daemons, and since it is needed for the Holy Inquisition that no one ever knows daemons exists, it is perfect.
Indeed, the main problem for the Inquisition to deal with daemons is "Oh well we defeated them. Now we need to purge that all 100k men strong imperial guards regiment and all its elite troops because they know the Dark Gods and their daemons exists. And then we'll need to brain-wash once more these Space Marines over there because we can't afford to purge them. Sigh.... Being an Inquisitor is such a pain, if only I had wonderfully strong soldiers that never remembers the horrors they see."
So sell your guys to the Inquisition, it will be very pleased and perhaps you will avoid an Exterminatus on your home world for using forbidden technology.