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House with bank

How about it's not an official banker, but a "banking official", with no bankbox. And you can only buy com deeds and create checks, and maybe cash in checks and turn in com deeds, but no access to the bank box to retrieve resources gotten from turned in com deed.

Like he's a banking official with a couple of pidgeons, allowed to hand out blank checks and commodity deeds. And he can send a filled check and a com deed to the bank by pidgeon to have them move gold and items into or out of your bankbox, but he can't have the pidgeons carry any of the items back.