One might suggest that in addition to the "western analogous filter" you identified earlier, one can add the concept of a "state." I would agree that Islam is the "only hope for a unifying principle" but seriously doubt it is unifying enough to hold "Afghanistan" (a state whose unnatural borders were drawn by outsiders) together for any significant length of time. Even if the US were to somehow succeed in establishing such a state, Afghanistan's neighbors will be sure to meddle as they always have once the US departs.
So while the goal you've provided is theoretically more achievable than a western-style secular democracy, it's one that I think is not ultimately in America's interest, nor a goal the US can husband into existence even it it were.
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