there are a number of things to consider.. One is exactly how much material you really need to take off, and the other is contact area.
First off, decide how much material you can leave and get away with. The less you take off the best. You can always take off more later.
One area that is gonna be affected is neck angle. If you move the front screws back, your distance between the fulcrum of the front screws and the end of the neck where shims go is gonna be reduced, which will make it alot harder to set and stabilize the neck angle.
If you want to really get crazy, find a short scale neck, deepen the pocket back towards the bridge till the scale length is correct and carve away. You would have to look closely to see the wrong length neck on a strat body without the guard on it.
I dont know for sure since I really dont know ibanez guitars that much, but I would think they would have put the neck pocket further back in the body to allow a deeper trunion surface. That would allow all four screws to be moved back.
If you want the aanj setup, try and install one of those anchored stud kits. That allows you to put a metal insert in the neck and have a machine screw to screw into it. I heard it works really well.
Or you could do the older RG type of access where you dont change the pocket at all, you just thin out the back of the body and use shorter screws.
Good luck...