Well, if you're going to head north, and you're thinking CDT,
personally, I'd look at doing a piece of it south to north looking to go through the spine of Banff and jasper, or just jasper. depends how long you wanna be out.

If I personally had 2 or 3 weeks to put to it, I'd go from Peter Lougheed Provincial Park, up either northover or the turbine canyon trail, cross into bc, up through the back side of banff past assiniboine, egypt lake, up through nigel pass into jasper, jonas pass, poboktan, maligne, hit maligne lake, cross onto the skyline and finish at jasper. lots of variants you can do there if you wanna head my way.

Done the pieces of it, never done it all at once.