The base game (to access these quests) is $40 for a brand new copy. It’s only $20 if you get a used copy.
These DLCs event quests are also free to download.
Still sucks they are being removed, but these were minor free 3rd party event quests to begin with.
Based on the hardware you have, if you’re able to install it on one of the routers, I know that OpenWRT can set DNS on a per device basis with it’s DHCP server.
My personal suggestion is to use a PFSense device as there is an option for per device DNS settings, along with a lot of other options that you might want to mess with if your trying to learn some networking