Sure. I have a couple of recent photos from both ends of the pool and then a professional photo from when it was open.
We actually did consider the idea of the automatic cover because I really want a solar cover anyway and I thought we'd solve both problems in one fell swoop. But the company we contacted has been very unresponsive and the very quick number I got from the woman I spoke to gave the sense that we were looking at probably $15k. And yeah, I am guessing we'd have tracks along both sides of the pool, plus the unsightly box on top to hold it. So that just seemed like a dead end.
In terms of a fence, we got a quote for like $6k for a nice estate fence, but again, I'd want to take it down in a couple of years, so that seems crazy. Since posting I've been looking into DIY options, but I am now realizing that the brick is not ideal for mounting the fence. I thought that maybe even a 3 foot high "garden" fence that could just be set into the dirt and grass that surrounds the pool would maybe be enough of a barrier. Again I can't guarantee that other kids wouldn't scale it, but my kids would definitely not (or pay a steep, steep price and never do it again). And we are not looking to leave our kids unattended in the yard anyway. We just want peace of mind that if our 3 year old found herself in the yard unattended for 1 minute, we'd be safe. I can't imagine we'd ever have other kids in our yard without adults watching in the yard at all times. Maybe someone would run in to get drinks for a minute, but that's it. So we don't need Fort Knox here. We just need something.
The DIY fence options would be less than $6k for sure, but I work a lot and don't know if I'd have the time to install it myself, so maybe it would be half that price all-in? Not sure if mounting it in the brick would work, so then maybe we'd consider the garden fence mounted in the grass/dirt.
After reading everyone's responses, I realize this is really a personal decision and that everyone's comfort zone and circumstances are a little different. I kind of just want to do something high tech like the infrared perimeter alarm coupled with some kind of backup, but I also now see how the fence will just bring me greater peace of mind and how that may just be worth it. And maybe it would also enable us to be just a little more at ease when we aren't sitting there with our 3 year old or when we don't have our phones or aren't near whatever alarm would be ringing with the high-tech setup when someone approaches the pool. This last year has been hard and I definitely need to make my life easier not harder, and it seems like a fence, while expensive and unsightly and annoying to have in the small patio space that surrounds the pool, may just be the best option.
But the feedback has been VERY helpful, so I am still happy to hear people's opinions!