And, Bloggsie, old mate, you completely ignore that Class A airspace is not intended for any kind of terminal control area, and is not used for CTA anywhere. ---- but I am not at all surprised, given you well demonstrated in-depth knowledge of all things CNS/ATM.
As for the Tobago, I hope you never have to fly (except as pax) anywhere in US/CA.
Tootle pip!!
PS: And do bone up on risk management principles, as it applies to ATM ---- you might well be surprised, despite what you fondly believe to be self -evident. truth. The clue is in exactly what the target separation assurance standard actually is, and it's relation to "ALARP" and "vanishingly small"..