I know there are codes you can add to give you the Beast Form power, which lets you turn into a werewolf, but does that really make you a true werewolf? I don't think so, not 100% at least.

There is a "Werewolf Abilities" spell you can add, but that gives you the +2000 carry weight, which is not right if you're not in beast form.

There is a "beast blood" version of the resist disease effect, which you could manually add, but what about the beast blood effect that makes it impossible to gain the well rested bonus?

Is there a quick "chain of commands" that can be used to really turn yourself into a full werewolf without having to do the Companions Questline?

No. Not in the way your want it. The meat of the transformation, including the rested bonus restriction is all done through the PlayerWerewolfQuest, or most specifically the PlayerWerewolfChange script(or something like that.).

If you want to avoid the questline, you're gonna have to get your hands dirty.

you may want to look into Tales of Lycanthropy on Nexus mod site. Its a great werewolf core mod.

Otherwise you can add the beast power to you through console commands. I had to do this when my werewolf glitched and I lost the power beast form for some reason. I was still a werewolf, restless sleep, immune to disease. But I could add the power back with the console.

But if you just want to make yourself a werewolf and have some cool core things to change like transform every night or every full moon. Look into Tales of Lycanthropy.

Oh right I forgot about going the mod route @_@. ToL, and Moonlight Tales, offer you werewolf status in full through a toggle.

Though I still prefer drinking Aela's blood because from an RP perspective, I'm pure that way. (and it's Aela, so I wouldn't have it any other way).

Aela is a great way. Would let her turn me any day

But the nice thing with Tales of Lycanthropy or Moonlight Tales actually allows you the dangerous possibility of getting infected simply fighting a werewolf. I like that.