Hi G.W.
I tried to take Yoshimo through as a dead man but he is removed from your line up as soon as Irenicus talks to you in Spellhold. If you remove him and leave him in a temple then you couldn't pick him back up until you escaped Spellhold anyway. It seemed to me that as long as Irenicus doesn't mention him by name then you have a chance of retrieving him. I can't actually remember the temple you mention but it's an option I didn't think of or try so your approach may well work.
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