Well, most things Necron only work for/with them; their devices draw power from their bodies, and are mostly useless if separated, and should disappear with the Necron, should it be recalled, I would think. This makes using Necron bits tricky, and so not much of a solution. Even if, then the Nightmare Science Necrons use, since they can't use the warp, would probably be so arcane and complex, a player wouldn't be able to make use of the device.

While I won't throw impossible around, because nothing truly is, I guess, your odds with the Knight or Spider packs are better, even if you don't have Psy Rating. Worst option, the Necron apparatus "recalls" when you try to use it, and you get pulled back to the Monolith with the Necron. Bye-bye, then. Also, Necrons don't have flesh, so anything they might get exposed to in the elsewhere medium they might move through could trash your ride (read: body) up. Nightmare Science!!!