I was just surfing the net, found this question and thought I's add my thoughts.
If you don't have any objections to something made with Maltitol, you may want to try Joseph's sugar free maple or Steel's Country Maple. People, including myself, always rate those the best. Neither have an aftertaste and there are only 2 ingredients (Maltitol & natural maple). Some are concerned over Matlitol, but I use only 2 tbls and never have a problem. There are also syrups and honey subs made with Xylitol by a company called Nature's Hollow. I have never tried them, but I have heard good things.
Hope you find a solution. The quest for a good syrup substitute can be tough.