In case you don’t feel like doing electrical work on some of them or find that the price of some of the options are too much, I wanted to suggest the ThirdReality Zigbee smart switch. They also sell them in four packs so you can save money.
https://www.amazon.com/gp/aw/d/B0CRB18DHG?psc=1
Where it fits with your requirements:
You can press it like a regular light switch (button-style) any time if you want to use it like a regular light switch
Goes over an existing light switch. So, you don’t need to deal with electrical stuff.
Can take them off the existing switch and flip the actual light switch manually if the whole smart switch fails
It does take mild effort to snap the device off the wall, but you don’t need a screwdriver, just your hands and determination
Better price than what you linked, and sold in multi-packs for cost savings since it sounds like you want to buy a lot of switches
Where it may not fit:
Maybe your wife will not think this looks like a light switch? Maybe show her one online first, or only buy one to show her.
The aesthetics can look kind of weird depending on the existing light switch plates
Could make the aesthetics nicer by changing out the light switch plates to match the smart switch, which could be reasonably cheap
Make sure it will fit all of your light switches. If you have non-standard sizes because the prior homeowners were free spirits, the device may not fit. They do have a kit to help with a small range of sizes.
I bought one first and tested it/measured it with all the light switches to make sure it fit first
Some info you did not ask for that may also be helpful to you/others:
I found the connection was a little inconsistent behind walls at first, but after adding a sufficiently thick USB extension cable to help lessen connection issues from interference they have worked really well. For longer distances/through lots of walls you may also want to have Zigbee smart plugs here and there/other Zigbee devices that plug into outlets that can repeat the signal and strengthen your connection.
In case you don’t feel like doing electrical work on some of them or find that the price of some of the options are too much, I wanted to suggest the ThirdReality Zigbee smart switch. They also sell them in four packs so you can save money. https://www.amazon.com/gp/aw/d/B0CRB18DHG?psc=1
Where it fits with your requirements:
Where it may not fit:
Some info you did not ask for that may also be helpful to you/others:
ThirdReality suggests buying a hub with them but if you have a USB zigbee dongle you don’t need it. Like this one: https://www.amazon.com/gp/aw/d/B0D737SJ5G?psc=1
I found the connection was a little inconsistent behind walls at first, but after adding a sufficiently thick USB extension cable to help lessen connection issues from interference they have worked really well. For longer distances/through lots of walls you may also want to have Zigbee smart plugs here and there/other Zigbee devices that plug into outlets that can repeat the signal and strengthen your connection.