Mostly idle speculation; I lived in South America for some fifteen years and am not in a great hurry to return but was considering a raid to Panamá, where my daughter was born.
Should be fairly linear process:
-- Get EPA approval
-- Remove DPF and disable EGR.
-- Test
-- Depart US, make trip.
-- Return, reinstall.
The trick is that at least one of the companies selling DPF removal programmers that specifically mention high sulphur fuel calibration have stopped selling. This makes it much harder.
Similarly, I don't know if the EPA will, in fact, grant an exemption for a diesel engine. They should, but you won't know until you try.
So I was hoping that you were in contact with someone who had actually done a DPF/EGR delete on a modern diesel.
As my first destination will be Europe, most of this is moot for me.
