An easier way that completely avoids damage to the drivers is simply remove them. The only caveat there is if the leads are soldered. Not sure if they are or not on the Sofias. Doubt it. It will make the process much simpler and less likely for an expensive oops moment.
WILSON ORIGINAL SOPHIA'S
I have decided to purchase a very clean pair of original Sophia's. I have been able to audition them with my amp. The results were much to my liking. Very coherent from top to bottom and a significant improvement from my current speakers. At some point I will need to replace the diffraction pads (both top and bottom) which are available from Wilson (They have started to deteriorate from age). If anyone has done this on their own...I would like to know how cumbersome it was. There is a how to video from Wilson involving using denatured alcohol to dissolve them but I'm not really sure I want to tackle it that way. Any suggestions?