I like the part about the deep dramatic event, even if Paul Haggis was writing Fraser out of character in VS. *g* But as you say, it can work either way. And it all works with the timelines you worked out.

The easiest way to do a reverse horoscope is to identify what Ascendants and Moons you're most interested in, but yeah basically you try to pick a time, place, date etc. that provides the correct combination. Professional astrologers use a technique like this for people whose birth time (most commonly) isn't known (in history, I mean) - it's called a "corrected" or "modified" chart. Basically it's a "best guess" chart. *g* But oddly enough it often works. I cast one for my husband a long time ago and identified the most probable birth time, which no one in his family knew. Turns out his aunt knew and years later confirmed my "window"!