Not as impactful as a realtime donation but I recently changed my Amazon Smile charity to the Signal Foundation after a few years with my previous selection. I was surprised to learn they were an available option.
I also installed a browser extension to automatically bring me to smile.amazon when buying anything on Amazon - so far it has had no weird glitchiness when not buying something and works exactly as advertised. Highly recommend looking into this option if you're forgetful like me - so far it has helped me donate 4 times that I would have otherwise forgotten.
I was jumping through similar hoops for a while to get Amazon smile donations, but then I looked at their numbers for how much gets donated and it was a pretty trivial amount. I don't remember what I found (anyone have any stats on Amazon smile donation percentages?) but I decided it wasn't worth my effort compared to adding an extra few dollars to my direct donations.
It's not bad if you connect it to an Amazon Business account. I give hundreds of dollars to the charity I select. Also it's a thing that's easy to opt-into with an extension and just goes on forever, so totally worth doing it.
I also installed a browser extension to automatically bring me to smile.amazon when buying anything on Amazon - so far it has had no weird glitchiness when not buying something and works exactly as advertised. Highly recommend looking into this option if you're forgetful like me - so far it has helped me donate 4 times that I would have otherwise forgotten.