Weapons of Torture

Can the grotesque who "may take items from the weapons of torture list" make multiple exchanges on that list? Relevant rule for that list is that "a Model may replace a melee weapon with a single weapon from this list".

Does each exchange being one for one satisfy the single requirement and therefore can a single grotesque be outfitted with an agonizer and a mindphase gauntlet?

well it says a (one) melee weapon with a single weapon from this list. Sounds pretty singular to me.

Right but Grotesques say they may take items from that list. I grant that Haemonculus and Acothyst's do as well but those each only have 1 melee weapon to trade will a grotesque has 2 and nothing about the rules seems to preclude multiple exchanges off a list.