My goal is to try and get a multifamily property a month or two after starting my job once I have the paychecks rolling in, to show my financial advisor.

the Most important thing is to find an market that is growing in population and Jobs. 

While some lender will allow statements from other countries and will convert to USD, the path of least resistance here is to have your funds already in the US and create a US based entity to vest on title. 

Based on my limited knowledge of real estate investing, one key is to buy distressed properties, fix them up and either rent or sell.  

I assume your wish to use a HELOC is to avoid paying interest when you are not actively rehabbing a BRRRR.

Another way is to check out this website.

My thought is to BRRRR it and refinance, and they get their cut of the equity (which I assume would be split 2:1:1).

Hey , yea thinking more on this, having other positions would be a tough sell.My strategy for substitution of collateral is to get better debt terms on an investment I want to buy.Ex.

We have a dedicated team whose purpose is to ensure that our passive investors never feel disconnected from their properties.

Another idea is to partner with someone who is located in PR and better understands the market.