I can not do tricks from flyout. That being said, I also do not think it is impressive to land a trick flyout. You can gain as much as two times the airtime and it is harder on your scoot.
It works fine. My brother's Phorx are stripped at the integrated starnut, so there is just a bolt and nut through the SCS. It has stayed dialed for 5 months now without touching it.
Let me understand, you want to trim down the IHC so that it fits inside the SCS?
If so, it will work, but it may not be strong. And I am not sure as to how you will get a starnut into the declare fork.