If your gaming group uses Forgeworld you
could use
the update of Imperial Armour 2. It allows you to take a valkyrie squadron (from
IA 2,
not codex inquisition) as a Fast Attack choice. And that's
only because the
FAQ specifically allows it - as Mr Shine says, it's not because of any edition-wide rules.
EDIT: I don't have
IA 2 2nd edition, so I don't know if it's horribly out of date. I do know that my 1st ed copy of
IA 2 is.