The DSCR loan would allow you to qualify based on the rent you are collecting and get up to 75% of the value (175 x 0.75 = 131.25k, minus 20k payoff and closing costs.You could get a line of credit or a bridge loan against it to borrow money, but it would be higher interest.

I would pull a FHA loan for $665,000 and live in one side and rent the other side out to a family member for $2,000 a month.

Can't you get a conventional loan?

As far as your next property, if you are already considering moving you will get better loan options + interest rates if you decide to live in the next property and rent out your current house. 

A non-recourse loan is an option if your SDIRA doesn't have enough funds.

THe lender is a credit union and it is a conventional low rate loan.

Ultimately the pictures combined with the location are what sells it.You want to avoid HOAs at all costs.

LTV 70% Loan $440K. 

That doesn't seem right about having to chase your money - but would need a lot more info to provide a better opinion. also are you investing in one property and is your name secured or you giving an unsecured loan? 

@Nick AmDepreciation is a ZERO % interest loan.