You don't have to pvp to get those skills. If you char is ascended just change into the profession that's needed to capture the elite and it will be unlocked for ALL your heroes.
For the Tease skill you will need to have Nightfall. And if you have Nightfall, Eotn you should be able to get at least 2 Necro heros (Livia and Master of Whispers). The other Necro (Olias) is available if you have all 3 campaigns and you do a Nightfall side quest.
Going to try that Me/Rt Tease hero...sounds like an interesting setup and I have already capped the skill

I do have nightfall, but I just have a dervish that is far and I don't feel like finishing it up with him.
Right now I'm running that n/rt, the me/rt, and a SF hero...its working pretty well, I just take the protection hench with and then whatever else I need. Looks like I'll eventually get another nec hero in eotn, so I'm just going to run it like this until I get her.