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SUBMIT YOUR IDEAI got both ways and pushed me to do only the angle calculation in a formula tool in my spatial solution
I managed to get the same result, but I didn't want to post because I couldn't figure out why I was calculating angle due East instead of North. The solution clarified it, definitely need to brush up on my trig!
I was using the calculations from here: http://www.edwilliams.org/avform.htm but I got stuck on the "angle" luckily the solution provided by @NaiLo held the answer :)