No, that is the way Allen screws let you AVOID using an EZ out.
For example a 3.5M screw (if that’s what you have): punch the center of the hex, drill with a 1/16 bit just all the way through the screw.
Apply penetrant. Install wrench in *unharmed* hex and turn.
This requires MUCH less skill than using an EZ out.
This allows penetrant to be applied to the top and bottom of the screw.
But if you can protect the other parts (wet rags?) and apply significant heat, that should certainly free these little screws.
Frankly, penetrant and shocks should.
Fun thread, good luck.
Your idea of drilling out the centers of these screws to relieve pressure, is a very good one. I can easily see that working.
I’m going to try the simplest approaches first, then move on to more intense handlings if they don’t work.
I’ll post a follow-up report with pics once I’m done with the job.
Thanks!