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So I was able to secure somewhat meh third party sisters models on the cheap as placeholders until plastic sisters. However my army contains two models which have obscure armaments and which the gw old metal looks like it should never see the light of day again.
The hospitaller and the Dialogus.

Im more concerned with the dialogus as the hospitaller I can just throw some bits on a regular sister. In all honesty because its an HQ and doesn't even have <order> it can be a male as its in the same boat as the missionary.

My question: Does anyone have any idea for a counts as model for the Dialogus I can use?
GW models attached for reference.

I use some Inquisitorial warband models as Dialogi. There's one available from GW of a dude reading from a book and holding a giant blowtorch on a stick. I use the same justification you mention... no <Order> and therefore might as well be Ministorum.