Just a few comments.
Carbon handlebars would be less harsh than alloy.
A carbon fork + high pressure tires is definitely going to have a harsher ride than 65 psi tires and a suspension fork. However, I ride on a carbon fork with high pressure tires all the time and am not bothered by it. The roads I ride on are pretty decent for the most part. If you ride on rough roads, it may not be the greatest. If you do get new tires, you'll probably be alright lowering the PSI to just over 100 for a smoother ride unless you're a bigger guy. Also look for tires with a higher TPI.
I'd be worried about a 2 inch shorter fork. Maybe some MTB guys who've gone to rigid forks have some input. You could try the mechanics forum too.