Akshay,If your moving out of a SFH primary and claiming 2-4 unit MF as a new primary it can present an issue with certain lenders.

If he says no, is my only option to back out and lose the earnest money deposit ($6,000) or go forward with the purchase, knowing I'll have a $3,000 - $5,000 bill or more if I decide to do this later?

Look forward to hearing from you!

Transfer or Rollover Funds: Move your funds from your existing retirement account into your new self-directed account3.

If you are buying it as an investment property, you are buying it at a much higher rate than a traditional owner-occupied loan so you must be in a primary residence now and are just planning a just-in-case scenario.At first, I thought this was a no-brainer answer as if you can do whatever you want, but those investment loans are banking on the income projected as part of the collateral for the loan so it's a good question.A seasoned lender or someone who has had to move back into one of their properties will get you the best answer.

I am planning to move to Dallas.

Supply and demand is very high right now because people are moving from outside the FL to here because of the what type of restrictions the COVID virus has caused in other states.

With the above done, now ready to move into step 3, actionable details. 

We are considering either selling the home or renting and moving into an apartment with much less overhead. 

Yeah I think a HML like @Logan Singleton mentioned would be a good move to call around or connect with a loan officer like him perhaps to see who would fund those type of numbers, but if you wanted to explore private money there's 100 ways to structure the deal.