You could create a feature issue in the official Lemmy GitHub (https://github.com/LemmyNet/lemmy/issues) which, if implemented, would get your feature into the officially maintained Lemmy. Then, you'd have to convince third party apps to adopt it too.
But are you evenly distributing your data amongst all your accounts right now (as in commenting/posting from all of them)? Because if not, your data would be lost if your main instance goes down anyway. What's the point of the other accounts?
Although it's now a larger organization, Redis was started and maintained by some guy that just wanted to make his website faster. It's very widely deployed.
Tailscale is Canadian