// I love that you asked this. Pahaha. In answer to your question, Armand could definitely not wield Mjolnir, for a few reasons. The first is that historically, he tends to refuse having actual power and just orchestrates things from behind the scenes or in the not actually stated, just acknowledged universally sort of way (see the theatre for the best example of that). The second is that an excess of power would not be a good thing for him to get his hands on, as he has a habit of experimenting with things he finds interesting, as we all know!
Finally, I saw this explained in a very interesting way here, which means that because the hammer is a fixed quantum point and only Thor has the proper resonance to interact with it on a quantum level, it wouldn’t be possible, technically, for any of the VC characters to be worthy of the hammer, if framed in these terms. Mainly because it’s not a question of worthiness, they just lack the proper resonance. If, however, we were speaking on a purely mythological level and not in terms of science, I would probably nominate Bianca or Gabrielle, since both of them are largely level-headed enough to make decisions about the power involved in possessing such an object without causing a catastrophe.
(Probably far more of a detailed answer than you wanted, buuut regardless).