It's the same for all Custom Deliveries NPCs (other than M'naago, who can't be glamoured). We can only use gear that has no role/job restrictions. There's still quite a bit to choose from.

But please remember that Ameliance wants a glamour that "would put Fourchenault to the blush". She's been such of devoted supporter of the Scions all these years (even if in secret) it would be a shame to disrespect her wishes.