So it's been a couple more weeks and I've addressed most of the fit issues. The bike has now become a pleasure to ride. One thing that made a surprising difference is the switch from a generic Kenda 700X25c to Vittoria Zaffiro Pro. It's not like the Zaffiro is a high end tire by any means but the ride difference is significant.
Before the crash and fixie conversion it was a very smooth riding bike so I was a bit surprised at the harshness of the ride after. I did have to replace the fork but the new one is chromoly and very similar to the original except for being a couple of mm shorter. There was also a handlebar change due to the old one being bent. I ended up swapping that out too last week which may be partly responsible for the difference.
Lastly, thanks to the generosity of another BF member, I got a set of double sided spd pedals to try out. I was convinced that clipping in and out on a fixie would be more of a challenge due to the pedals being in constant motion but it turned out to be a non-issue.
So long story short, I am now something of a fixie convert and it's become my regular commuter. I'm tempted to ride it at least partly into the winter months to experience the benefits of fixed gears in winter that others have talked about. The problem is that I really don't want to trash this bike, - even though it may not be that attractive in the conventional sense in its current configuration. We'll see.