If you like the idea of a self-directed HSA like @Kaaren Hall mentioned check out providers like Accuplan and IRA Financial Trust. 

Purchase price: $172,000 Cash invested: $43,000 We purchased this rehabbed home and added a privacy fence, removed overhanging trees, finished the countertops, built a firepit, security system, camera's, fixed the sidewalk and turned it into an airbnb.

You didn't write how much 'sweat equity' you put into this place, but it was likely well worth it given the $400K cash out.  

I'd say 1% deals are going to be more of an appreciation play rather than a 2% deal which will undoubtably cash flow. 

BRRR's or flip can recycle your cash so you can rinse and repeat.

Based on the numbers you provided, these are well above the debt service coverage ratio of 1.25 hence from a lenders perspective, this is loanable.

Can provide all the benefits from a cash flow and tax perspective.

There are some that provide coverage but of course the premiums and higher. 

Use the HELOC on cash-generating opportunities like flips, then use the cash generated to buy long-term buy and hold investments. 

If they’re not able to assist, I also have other LAIC referrals as well that will just provide the service only.