I haven't found the closing costs to be any higher than with a traditional loan and I have several portfolio loans. 

@Isaac Geller  I can't speak for the all areas of the US but generally phone calls are still done through the traditional phone networks/phone numbers. 

They usually learn about it when the title company asks for a payoff notice (as they would with a traditional purchase.)Otherwise, banks only seem to notice a change was made if the loan starts to default. 

Are there other options out there for new home buyers who are only a few months away from having all the technical 'rubber stamp' items a traditional lender requires?  

The OP hit on a lot of the reasons I expect on-going near term rent appreciation but one implied, but not out right stated, is that the rent to value ratio is not where it traditionally is at. 

Does anyone know if you can convert traditional washers and dryers into card operated machines?  

And typically a house hack requires a lot less down than a traditional investment.

Have you been able to get a traditional mortgage loan on the property if it’s in an LLC?

Although riskier, if your goal is to cash flow $4k as quickly as possible in many cases renting on the short term market like Airbnb will earn you much much more than a traditional rental, in some cases double or triple. 

I think my characterizing that particular property as 'A-class' was misleading and confusing as it's def not that in a traditional sense.