When put that way, I might suggest that to the player to keep in mind, especially for play and leveling up. Since, the largest appeal of the combo narratively is the branching potential so if they ended up giving into their Whamp urges I'd imagine their wizard abilities might drop off and vice versa (especially if they somehow get the conditions to remove Whamp Virgin mantle).
I think a full-on (non-Virgin) Whamp has similar benefits from concentration as a wizard gets. Papa Raith, Lara, Thomas -- the ones who are dangerous even among Whampires -- show that they have a LOT of discipline, focus, self-control. Whamp-Virgins notsomuch with the self-control !!!
I would expect that trying to "level up" both at once would be very VERY hard. I could see a Whamp Virgin with the Salic Gift getting some training as a Wizard 'prentice young (and carefully without any MOTAS' around!!!!), then laying magic aside while they roil around in Whamp-V Puberty, maybe? Then taking up wizardry again once the Demonic Hormones settle down a bit ... Maybe?
It appears that Whamps CAN use some magic... q.v. Vittorio in White Night (granted, most of the Big Deal stuff was likely done by Cowl or the Outsider, and when the duel went down, he was straight-up WCVamp combat powers of speed & strength)... Thomas can work Harry's tracking-spell.