I saw a few parses between blood moon and tzvogin and blood moon only beat it by a small number. Tzvogin would enable this build to perform way better in human as well.
Werewolf will be changed in Greymoor. Keep that in mind. That being said, your build will receive a straight buff from what we can tell from the leaks and reveals.
Relequen+Tzogvins is generally a good combination, so investing in it is worth it. Even with a Bow/Bow setup you will deal a good amount of damage. On my bow/bow stamden I've managed to hit 68k with that, which is low by high-skilled standards but very high for the average player. A better play could easily pull more dps than me on the same build.
If Class is negotiable in this, I would recommend Necromancer over Sorc for the 15% increased dot damage and 1500 physical penetration.
Sorc gets 5% increased physical damage and 10% increased damage but only at the start of the fight, losing dps the lower your enemy gets. All of your poison morphs from bow skills are unaffected by the 5% increased physical damage passives from sorcs, but most of them deal damage over time or have a damage over time component to them, which is affected by the Necromancer passive.
Even in Werewolf form you still have a lot of damage over time effects going, like the bleeds from your light attacks, Relequen, the new execute damage over time on Pounce we'll see with Greymoor and your Infectious Claws.
Furthermore Physical Penetration is not easy to come by on stamina builds, because most medium armor doesn't add physical penetration like light armor gives spell penetration. This forces you to put a lot champion points into penetration to make up for that, which you could invest into more damage otherwise. With Tzogvins you already have a penetration bonus, but having another from the necro passive is going to make this even better.