It depends on what the Valknut is in the GC universe. If it is simply something that appears whenever an Asgardian opens a doorway to the Rainbow Bridge, that's one thing. If it is the path that goes through the Realm of the Dead, that's another. If it is the sign of the All-Father and draws on his power, that's a whole 'nother thing completely. Eglamore, a mortal (as far as we know), apparently can use at will something associated only with Norse gods and the dead.
THAT... has implications.