Pics, videos, move in/out reports, estimates, and invoices will be hard to defeat. 

For your own business, you'll be co-mingling funds thus defeating the purpose of a separate LLC.Bottom line, you'll need a separate account.

It defeats the whole purpose of it. 

As was mentioned above, PMI with FHA loan won't ever go away until you refinance it with conventional which is defeat the purpose of house hacking.

You are asking a lender to fund 100% ltv in 2nd position which is unheard of unless they are getting compensated with very high interest and fees for taking the risk, which defeats the purpose since you said the reason for trying this was to get a lower existing rate.

Too much, and you defeat the purpose of REI.  

I'm not an insurance professional but I am a real estate investor/manager; which ever route you decide I would just highlight that you are getting insurance for a reason and it defeats the point to have 'coverage' that will not cover you when you most need it or go with a company that is not stable to support your claim should you ever have one - Me personally, I'd rather pay a bit more for absolute coverage that to pay cheaper premiums and one day turn for help from my company only to realize that they won't.... but the premium was cheap.

The easier "get out of jail" card is to sell the house but I always hesitate to give such self-defeating advice. 

If not, you are basically comingling the personal asset(Its your loan, not LLCs) with the LLC's asset and that defeats the purpose of having the LLC. 

Doesn't that defeat the very heart of these laws?