There is a new pull request by Duncaen against master on the void-packages repository

https://github.com/Duncaen/void-packages update-local
https://github.com/void-linux/void-packages/pull/37700

xbps-src: add update-local and show-local-updates
This makes it simple to bulk build all your outdated packages in the local repository, works with `-r` and branch repos.

There are two similar commands that already exist:
1. `update-sys` which builds outdated installed packages.
2. `update-bulk` which builds outdated packages in configured repositories, so depends on having synced the hosts repositories
and depends on builds already being finished in the remote repos.

With `update-local` you can instead just build a packages manually once and then update them with `./xbps-src update-local` without depending on the state of the host system or remote repositories.

A patch file from https://github.com/void-linux/void-packages/pull/37700.patch is attached