That's a very elegant way of doing it! I need to do something similar with my setup one day. Having everything hosted in my home gives me the most control but also a lower availability than if I ran everything in someone else's datacenter. Currently an outage means that browsers and other clients just time out which is not very informative. Have you explored any other options? I was thinking of spinning up a dedicated VM somewhere to handle this and automatically switching over DNS entries at the same time (maybe automatically update DynDNS when the VM boots).
WRT is this relevant to selfhosted: I think some people will disagree, but Cloudflare is still selfhosting. It's not localhosting, but as long as it's services that you provision yourself it's selfhosting.

Executing people is always unethical. But in this case it's not even necessarily adultery, it could be polyamory (or some other ENM).