You wonderfully resumed what I was trying to say. All the better, that you have experience with Philippines, highlighting that this is indeed global problem, that has to be dealt with. Indeed the solution is as simple at it is universal. Held the criminals guilty in the eyes of people they fear and respect the most - their own family. If they act for themselves, they can claim to be martyrs, but if everything they archieve is suffering for those closest to them, their own people will start to see asocial behavior as a mental illness and move to crush it.
Yes. They tend to be very clannish so might as well put that tendency to good use. While you're at it, might as well boost the birth rate in Europe. It need to be at least above replacement level. Give them incentives to have at least 3 children.
To prevent any particular group from carpet-bombing the place with their screeching spawns, put negative incentives for having a lot of children. Maybe after the 4th child, the rest would not be getting benefit so the parent would have to take money out of their own pockets for things like vaccines. (They shouldn't have children they can't support in the first place anyway.)
Apply the policy on a per household basis so that having multiple wives would not allow you to have 3 kids on welfare per wife, preventing people from abusing the incentive.
Your points can never be put in to practice. May be they can be implemented in some of the third world nations, but definitely not in the western nations. If a government in the western world attempt to do any of these measures, then the judiciary will anull the measures, and most probably the president will be impeached and put to trial for inciting racial hatred.
And that's why Europeans have this problem. They've allowed themselves to be bred out and to be easy targets. I was actually shocked when I found out that police there don't carry firearms. I'm all in for personal freedom and all the goodies humanism has brought but unbridled liberalism can also cause problems. Even oxygen is poisonous in high amounts.
Anyway I'd suggest a book https://books.google.com.ph/books/about/Shall_the_Religious_Inherit_the_Earth.html?id=nXVylycU2gQC&redir_esc=y For anyone who want restless nights, I suggest you read it.