Based on my experience, the converson is unjustified. You will not get noticeably simpler shifting (Modern drivetrains work quite well) and the weight savings will be measured in expensive grams (Especially if you use a clamp-on rather than braze-on front derailleur - plus it'll look a mess).

On the other hand, if you'd said you're bending under peer pressure (Your riding buddies are razzing you because you have a triple) or you just think a compact crankset looks cool, then there would be ample justification. If this is the case then go for it - FSA carbon compact crankset (Use a 50 T outer chainiring and the brazer-on derailleur should be fine), a 'ti' ISIS bottom bracket, and a short cage Ultegra rear derailleur.