Yeah, I actually do wish that Void had some way of adding third-party repos. XBPS supports it, but none exist.
Also, many third-party srcpkgs do not compile well on musl, and AppImages aren't supported yet. I think I might reinstall with glibc until musl is a little more developed.
I wonder if you have thoughts on Artix? I'm going to do an Artix install soon, I like the sound of it as it's systemd-free (you can use runit with it like Void) but still lets you use the AUR. If not for that I think I'd go with Void instead though, I hear fewer people complaining about things not working with Void so it sounds to me like Void might be more stable than Artix.