I’m a hard no. Here’s why.
A coating on a weapon functions as a Weapon attack that can be Parried, Evaded, or Dodged. Ergo, I would rule it cannot be used with attacks that cannot be Parried, Evaded, or Dodged.
I’d be fine with it being used with any numerical Weapon qualifier, because those are compatible with other weapon coatings.
Since you can’t stack multiple coatings, it would indicate you could only use Vorpals where you could use other coatings. You can’t swing for 30 Spell Strike Nausea, so I would rule you also couldn’t use that Vorpal to do a 40 Spell Strike Flame, too.