I feel like Imbueng ethereal flash would be a bit weird. If it’s already imbued with aether magic then it shouldn’t also be imbued with whatever you magic is? Maybe vetex could make it one of those weapons that only warriors can use. But this would then conflict with the items description, that says it is made of an arcanium alloy, so therefore it would be an arcanium weapon.
Arcanium isn’t restricted to one magic.
It can channel several at once, as seen with Apotheosis, Theos’ staff.
It had all three of his magics, Phoenix, Sun, and Fire.
Unless the Triasta has already reached the Singularity stage, conjurers will be able to use it just fine.