The debhelper one is a false positive. dh_python3 is a debhelper add-on, but the way I used it doesn't actually require debhelper.
I missed I was overwriting the libc depends. I'll fix that. Thanks. Using the versioned python3 depends is the standard Debian way to do it (makes more sense in cases where you're supporting multiple versions and you don't want to force them all to be installed). -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]

