It is not too late to be targeting trout and char with egg patterns. In fact, you can do so quite effectively until late February. The eggs will be in the redds until that time and some would drift away when disturbed by various factors. Obviously the fish would be more concentrated at certain locations when eggs are being deposited so fishing under those condition is much more productive, but we've had just as much success later between December and February by covering more waters.
A few years ago, I chose to drift the egg presentations throughout the entire season and did very well until the first week or March. From that point, they basically stopped working while the other friends did well by flyfishing with minnow patterns.
If you are not targeting them by flyfishing, small gooey bobs that measure 5 or 6mm in diameter work quite well when threaded onto a size 2 or 4 hook. Instead of using the conventional baitcasting or centerpin setup that is much too heavy for these species, I prefer to use a long spinning rod and a small spinning reel that is spooled with 6lb test main line.
Don't discount the chance of hooking into some mountain whitefish also. These are also in the salmonid family and they in fact fight just as well as cutthroat trout, if not better sometimes.
Don't neglect some of the smaller creeks that drain into the Lower Pitt River and the Fraser River between Maple Ridge and Harrison. With this type of fishing, one location doesn't out perform another. The fishing result changes from day to day, or even hour to hour as they are opportunitistic and highly migratory when seeking for food sources.