Assuming your insurance agency is a separate legal entity (easily done since it sells for several different companies), it would make no difference who the insurors were or whether they were publicly traded. Your customer is the agent, not the insuror. Phase I is out.
Phase II would be possible only if no more than 50 per cent of their gross revenues are derived from their activities as an agent for financial institutions. If that's not the case, phase II is out.
It sounds as if you agree with the advice you received. So do I.
Drawing on ancient history, this sounds like what used to be called a "debit agency," they sell to people of limited means and collect their premiums in person every week or month, oftentimes in cash. Even if you determine they are technically eligible, it would be a judgment call to recognize them as an exempt person; I would rather file the CTRs.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.