I'd suggest you go with the pillowcase idea or just mist the snake and leave it be. Sometimes encouraging the snake to slither face first through a warm damp, slightly rough face cloth works very nice for stuck sheds on the head area. Physically messing around with eyecaps unless you know exactly what you are doing, have experience and an incredibly steady hand, plus a lot more guts then I have, can be a recipe for a permanently damaged snake.

We've had rescues come in with as many as 5 layers of caps. Soaking, the pillow case, the face cloth, etc. have always worked for us. We never go directly at the eye itself. What we can't get off in that initial cleaning up session, usually comes off in later sheds. I remember speaking with Adam from 8Ball when dealing with our first badly stuck rescue (the one with 5 layers of caps) and his advice is what we still follow to this day.....be patient, do the least amount of direct messing about with that eye, get off what you can with simple methods, encourage subsequent good sheds and it will be fine. He was right.