comment ter vs tre 
Hi, Loved your essay.  I have had some thoughts in this direction my self.  My goal was not only to unify English spelling, but to make it more consistent and easier. I like the ideas you have here as beginning that.  

I do have one thing I'd like to comment on: ter vs tre.   As in center vs centre.  Everytime I see tre I want to pronounce the "lettres" in the order they appear. -)  As used in outré.  So I end up with sen-tray for centre and sen-ter for center.  I agree it would be better to have just one unified way to spell the "r" sound. 
I understand your point about etymology, but I'm seeing eventual confusion of people over centres and lettres, bettres, wettres (letters, betters, wetters ). There are many more words that end in er in Commonwealth English, (CE) than ones that end in "re".  Its a smaller change to have all words with the "r" sound at the end in "er" form, then changing them all to  the "re" form.  This reflects the idea that simpler, more internally consistent spelling is best, and it still provides a path to the Unified spelling that is your goal.   

P.S - have you seen Mark Twain's ideas for fixing English Spelling?  http://web.archive.org/web/20030629161605/http://users.telerama.com/~joseph/simple.html. Funny and True!