Would something like this meet the need, especially for the older ones? https://www.amazon.com/Mpow-Headphon...8&sr=1-16&th=1 I would totally buy them if we were in the market.
Also, 2/3 of mine have asked DH for a mouse to use. One has this trackball https://www.amazon.com/Logitech-M570...s%2C163&sr=1-3 and another has an older wireless mouse I used to use. They seem very content with them, so I'm inclined to get something for the other kid. Anything that makes their schoolwork more comfortable is a priority.