i personally liked the Kane with the mask, but also it would be very hard to pull off it at all possible. One idea i thought of would be to have him find the mask and think about the old days with the mask. Then have him maybe put it on for old times sake and have it make him feel like a new person. But instead of having him wear right off the bat maybe have him be tempted to start wearing it and when he wears it he becomes more and more evil with it on. Then after a couple weeks have him just wear it all the time and become the monster heel once again.
Im not too positive that this would work, but what do you think about it?
if they wanted to do this i think that this would be the best way to do it storyline wise