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.
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- Can take them off the existing switch and flip the actual light switch manually if the whole smart switch fails
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- It does take mild effort to snap the device off the wall, but you don't need a screwdriver, just your hands and determination
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- 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
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- 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.
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- 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:
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.
I have mostly just lurked here and wanted to come out of my shell to say thank you, admins, for all your hard work on this instance. You did a great job running this instance and I'll miss being the goblin hiding in the corner here.
Best of luck with your next endeavors.