/puts face in hands over a terrible idea but WHAT IF SPELLCRAFT

Five would presumably drag Hermione into this, on account of being "family" for this arc, and she could potentially disguise them. unlock doors, lock doors, stun people. put them to sleep?

There was that ward she used in DH where snatchers wouldn't see the golden trio while they were in the woods... a disillusionment charm could be useful too and she's well-versed.