I keep a text file in my Greek folder that contains a key for the Greek polytonic keyboard keystrokes, some of which are so arcane I never seem to remember them. I also have characters in there that have no Greek polytonic keyboard equivalent, such as alpha+acute+macron for Homeric plural genitive case (only works with the New Athena Unicode font). I cut/pasted them from Character Map to the file. Then I cut/paste them from that file to my Pharr exercise files. It makes things a little easier.
I, Lex Llama, super genius, will one day rule this planet! And then you'll rue the day you messed with me, you damned dirty apes!