If anything happens to the property, it is the lien holders loss...title transferred, but there is still a lien...this is a very problematic situation.

I bought one of those swiss army knife looking key holders but it isn't great because the keys tend to come unfolded from the case on their own. 

Please search for E2 visa for example , or the EB5 programGenerally speaking - money and real estate don't guarantee anything immigration wise , but they all play a big factor if you do it correctly

We set up an entity that will take title to the new property (called an exchange accommodating title holder). 

However i'm not a resident or citizen of the USA so would this be possible through setting up an LLC and still living abroad and doing any related work remotely, or would an E2 visa be the best option. or would it not be possible at all?

you typically do this at least a week before the sale and verify the amount owed to a lien holder to try to make sure there is not an accidental foreclosure sale of that property. 

I did also invest in their Cartagena Suites project because I need a little more investment to qualify for my investor ‘s VISA.

What I am looking to do is leverage their investment for just one deal at a time allowing them to be first lien holder on the property and then prove the value and work towards a relationship that will allow me to use the funds for say 6-12 months, with payback terms and interests allowing me to turn that money over a few times vs. just one property at a time. 

Buying house and selling it to new owner while you become the note holder on the house.

Just pay off the lien holder the tax amount plus the overage etc.