Do you have rehab skills? 

Though I have not checked with a lender yet I feel I’ll not qualify for a loan of about 750K given I already have 2 mortgages in my name of about 500K. 

And unless the topic came up in regard to monthly income that they needed to qualify for the home; there’s a good chance you are being manipulated.

In Dodd Frank, they anticipated that some might carry paper to get around Dodd Frank (not that you are doing this) and therefore they also "cast their net" over seller carry backs.Most importantly, please don't rely on what I say, except to inspire you to seek legal advice (which I am not qualified to give) from a qualified attorney in this area, and structure this so it doesn't get you into legal tangles or possibly worse, interaction with the CFPB.

The 10%+ loans appear to need either a qualifying CFL or a Broker to write the note. 

Then I would follow up with a 1031 qualified intermediary to ensure each step doesn't violate any rules and follow up with a CPA who understands real estate to compute the tax implications. 

Are you trying to flip or househack, they are two completely different skill sets. 

Since I'm gainfully employed and have quite a bit of savings I don't qualify.

Since I have renting experience (which I've read is a qualifying factor to be able to use projected rent income towards DTI) will I be able to use that towards my next multi I plan to do an FHA on?

Surprisingly strong response with 12 inquiries within a few hours and 3 qualified applicants to choose from after an open house that had 8 groups turn out.