I would probably just use a “robot finger” to push the button, assuming one fits. It’s a no-wiring solution that can work well for the last step in a retrofit. I use these in my own home. They may not be the least expensive solution, but they are often one of the easiest.
There is a cheaper, less elegant competitor just coming on the market as well. But I don’t know anything about them other than their marketing materials. I’m waiting for them to show up on Amazon so we get some field placement reviews.
