Tribe3 If I have a shimano 2300 triple chainset on my bike, is it possible for me to change to a double front chainring but keep my triple shifter?
YES!! Providing you position the new double correctly! It's just a double click with the left lever to move to the outer ring on your C/Set; and with there being no third inner ring! You may need to adjust the stop screw on your front changer; but, that's a simple adjustment.
So why not just remove the granny ring and set the stops on the front mech to stop changing down to it? This is quite a standard thing for MTBer's to do, they often replace the big ring with a bash guard.