Decided margins were too slim and chose to search out greener pastures. 

The idea  that you could find the trustee and somehow scoop these up is slim to none in my opinion.

It seems finding cash flow deals is slim-to-none, unless I'm looking at war zone areas where entry price is low but rents are high, and so I've pivoted to focusing on appreciation with the expectation that rent would cover all expenses + a little extra.

If your return is so slim that you're worried about the value of money decreasing over time, it may not be a good deal. 

There is a risk of them calling the loan due, in which case you’d have to sell or come up with the money, but those chances are slim.

The market is still super hot with rents high and vacancies slim to none.

Yours sounds like a slim deal. 

Slim to no odds on the loan being called.

If you're not under contract for your replacement property before day 45 your odds of getting it are slim. 

Slim chances you would get caught even then but the penalties of mortgage fraud probably aren't worth testing the waters in my opinion.