Been using Void for a while now, at home and at work, about 4 installs in total.
I have my own packages repo which follows the official void-packages closely where I keep my custom templates, they get built by CI and signed, so on my void machines I simply add my repo to xbps config and get all my junk. Here's the repo: https://code.hosaka.cc/hosaka/vast-packages
In addition, I rsync the official repo to mirror it on my server that syncs every few hours and my custom packages are build against that (see the CI workflow in the repo). This also has a benefit of being able to update the packages on my machines from my own mirror at much faster speeds.
It took me a while to get things setup this way, but was worth it in the end.