Its fair for you to say that when I say I'll stick with the move that others use that its the most heartbreaking sentence you've ever read... but allow me to say the same for your comment of " just trying to think outside of the box" . That line is said... WAY too many times by those who ( with good intentions ) don't have the experience to make that comment. I'm guessing you don't perform the Zombie.
Lets make something clear... I know what you are saying regards the physics that the ball would pull off the cloth. That part I get.... the part I don't get is what kind of alternative you could offer. The 4 corners part wouldn't work and would look awkward in my experience and if it could be done it would look effective for a few seconds only. With that said I am ALL for new thinking and if you have a better method I most whole heartedly would LOVE to see it and use it with your permission.
I said the moves sells the illusion because it show interaction with the ball. A bit of mine causes he illusion that the ball wants to escape but you restrain it and pull it back. You only have a 2 ft distance the ball can move. Once it has done that you have to somehow get it back to you so it can move that 2 ft out again. When doing the Zombie the last thing you want is a static ball not moving. In my opinion that is much worst that the problem with physics you mention.
Here is an old video of me performing it at the end of my floating ball routine. I don't perform the Zombie as a solo bit anymore because I do a Losander Table instead these days. In this video I use the move that you don't like to direct the ball back to its basket. http://www.timothydrake.ca/fltballbg.wmv