not possible to use the old 'dark orb of the mind' trick ..........it helps all caster not just warlock.
wizard with dark orb/mythical/bloodthirsty = 30% increase to ALL spells just not 3 (1 of which isnt used) - and they have 10% spell double attack on top of that (not to mention the fact they arent hampered to single target when they click their mythical!!)......its a no brainer which one anyone with any sense would take given the choice of wizard or warlock one.