You are young and presumably single, so living in a master suite while renting out some other rooms is easy.

A law suit runs about $25,000 and a year and a half.

Ideally this would be a multi-family property that I can live in and rent out the other units.

With seller financing, you are already on the back foot so it seems like this would be a good time to make an asking price offer if your numbers suit it.

Ultimately, you will need to have the borrowed funds in USD and ideally in your US business entity bank account to sail through underwriting with US lenders on US properties.Caveat: the rates will likely be something like 10-12% so it would not make sense on a long-term holding, more like on a down payment on a purchase and rehab value-add project that you will eventually sell (or cash-out refinance) to pay off the borrowed funds in a few months. 

Investing in  2-4 unit properties within the Dallas-Fort Worth metroplex would be ideal but I am also interested in other potential deals, that fall within the 2-4 unit range.

You want enough so that a potential law suit would go away if the insurance paid out.Best thing is to highly maintain your property and treat guests with respect so that no one would ever want to sue you.

Most HMLs I deal with require a minimum of $10k equity (or 10%, whichever is higher) in each property.

A nice but expensive duplex on a beach or in an expensive area might be ideal, if you can swing the other half out of personal funds. 

I personally am not trying to build a portfolio of 100 doors, I am trying to build a portfolio big enough to support our ideal lifestyle. - We start with the property vs. the numbers.