Crossbeaks can do OK, but not usually when they are this severe this early in life. The condition will continue to worsen until the bird reaches its full skeletal growth at 16-18 weeks (maybe longer because these guys tend to grow out slower due to the problem).
You need to decide how much time/effort/resources you have to invest in this chick. Once you make that decision, you can best decide how to move forward. This chick is going to need a lot of help for its lifetime. If you are prepared to do that then the posted threads will give you lots of good advice. If you are not, then euthanization would be kindest.
I am sorry. Good luck with whatever you decide to do.