Missy,
About three months ago we had to make the transition from the wireless doorbell also. The IT Specialist from our state chapter sent down a modified pager with a "switch" attached to it. The switch is nothing more than a 1" clicker used with the headmouse applications for your computer. Anyway...in the past month or so, even that has gotten harder so I've made my own modification by taping a popsicle stick across the top of it. That way we can lay as many fingers as it takes across the top of it to apply the amount of pressure it takes. Every time we roll her in the bed, I'll exercise her fingers to keep them loose, as we get her comfortable again. So far, so good. In addition, Dad found something online called a "Twitch switch" (I'll see if I can get you some more info) which you're able to tape to a person's skin. You're supposed to put it somewhere the PALS still has movement, and anytime they twitch that part of their body it is set up to something like the wireless doorbell to where a beeper goes off. Mom still has control of the muscles in the upper part of her face, so we'll would put hers on her forehead. If you come across something better, please let me know! ...there aren't too many inexpensive options as I'm sure you've seen.
