Congratulations on taking this significant step towards owning your first rental property! House hacking truly offers unparalleled advantages. The reduced cost of living opens up so many investment opportunities and enriching life experiences that might have otherwise remained out of reach.
When my husband and I acquired our duplex, both units were already occupied. In order to secure our FHA loan, we opted for a strategy known as "cash for keys," where we incentivized one set of tenants to vacate. This approach, commonly discussed on BP, could potentially address your concern regarding below-market rent. You could discuss with your lawyer to determine if this avenue is viable for your situation.
However, it's also worth considering the value of having reliable tenants. If your current tenants are exceptional and the financial numbers still align despite the lower rent, there's something invaluable about the peace of mind. Sometimes, the assurance of having trustworthy tenants that you actually like transcends monetary calculations and contributes significantly to the overall enjoyment of property ownership (especially when you're neighbors).