Well I'm half way there as it stands - have downtube shifters for front and rear but haven't quite got around to converting back to a double yet. Liking it so far - I like the minimal faff to go singlespeed or swap bars down the line and the DA shifters themselves are lovely.
The downtube shifter is great! I run 1 x 8 on my disc trucker and on my wife's CC. So easy to maintain and perfect for London.