Of course, Islam can be practiced in the US using the approach I described. I'm basically saying that the part of Islam which causes Islam to be excessively prone to violence and discrimination to non Muslims be defined as not part of Islam, and discarded from the religion by law.
Basically, my approach is that no religion can act as a cover for criminal behavior or insurrection. It's just a matter of degree as compared to allowing 'religious' human sacrifice, sex with animals, cannibalism, etc. Are we saying we're not secular because we don't allow the religious practice of these criminal behaviors? Then why should we give Islam a free hand to plot mischief under the guise of 'religion'?