Thank you for sharing so lightweight and maybe easy to operate buttons? My top choice of my own toys would probably be the Cha-Cha-Cha as it’s very lightweight and bar turning it on your wife doesn’t have to press many buttons (which are easy to press) getting to a setting she likes and, if she’s like me, probably doesn’t need to go through options once there. It is pricey but it’s beautifully rumbly, has a soft dual density type feel and hits all the right spots both inside and out.
I would also recommend having a read through the Disability friendly purchases thread for some helpful suggestions.