How to 'root out jihad from within'
Incentives matter, and how we incentivize a system is important. This would incentivize the immigration system to force various groups to self police, or face immigration restrictions.
I would suggest another, perhaps more difficult, but positive addition that the group make strides towards assimilation, for example through employment, charitable work, and similar venues. This might be difficult to define, but once defined would likely provide another positive action to help tamp down radicalism in these new immigrant communities.