This gives you more flexibility to make changes. 

Your best bet for locating and connecting with this individual is on BiggerPockets or your local REI meet-up.

It can be a flexible way to fill the gap.Private Investors or Partnerships: Bringing in a private investor or forming a partnership could provide the necessary funds.

I would also add that investors are often interested in Blanket loans because they mistakenly think it will save significant closing costs, but they do not as you will still need four title polices and appraisals etc. and you will get far worse financing terms on the loan and have a lot less flexibility down the road to refi and sell properties.  

Private money lending typically comes from individual investors or friends and family, often based on personal relationships and trust, and can have more flexible terms.

Here’s a breakdown to address your questions:30-Year Fixed-Rate Loan for Non-Residents: While traditional 30-year fixed-rate loans might be harder to qualify for as a non-resident citizen, non-QM lenders offer flexible options.

However, if you’re unsure about future property values due to the unique nature of the property, this could pose more risk.What You May Not Be Considering:Financing Flexibility: Using a HELOC for repairs is a solid plan, but make sure the loan terms are favorable and the rates are manageable over time, especially with interest rates fluctuating.Vacancy and Maintenance Costs: Once all units are rented, factor in potential vacancy periods and ongoing maintenance costs, especially with multiple units.In conclusion, while the repairs are a big expense, the strong rental income potential suggests it could be a good deal if you manage the rehab costs well.

HELOC Flexibility: HELOCs often have variable interest rates, which could increase over time.

This can help reduce the principal more frequently, which means you'll pay less interest over time compared to just making monthly paymentInterest Savings: Bi-weekly payments often result in more interest savings over time compared to a single large annual payment, as the principal is reduced more frequently.Flexibility: If you have a good year financially, making a large principal payment can give you flexibility, but it may not be as effective in reducing interest if the loan has high monthly compounding.If you're looking to pay off the loan sooner and save on interest, bi-weekly payments are generally more effective.

If you’re just starting out, a long-term rental could be the safer bet for consistent returns and lower management hassle.On the other hand, some investors prefer out-of-state opportunities for better cash flow and affordability.