The real challenge facing a kremlin linux fork isn’t opposition, it’s deciding what to do once they realize there aren’t any maternity wards in the kernel they can shoot ballistic missiles at.

DNS is what you’re looking for. To keep it simple and in one place (your adguard instance), you can add local dns entries under Filters > DNS Rewrites in the format below:

192.xxx.x.47 plex.yourdomain.xyz
192.xxx.x.53 snapdrop.yourdomain.xyz

What is your root filesystem installed on - lvm, zfs, or bare disk partitions? Are you booting with grub (legacy/bios) or systemd-boot (uefi)?