Unless you have a "purist" point of view that insists you have to do the whole trail, why not just do the most scenic parts of the Washington PCT?
Between Snoqualmie Pass and the Canadian border is almost all good. There are plenty of side trips along the way (Image Lake near Glacier Peak is one). Skip the section between Chinook Pass and Snoqualmie Pass (some scenery, especially the part close to Chinook Pass, but lots of clearcuts on the remainder). Hike from Mt. Adams through the Goat Rocks to White Pass or Chinook Pass. If you have time left, go down to Oregon and do the loop (55 miles plus side trips, such as a climb of South Sister) through the Three Sisters Wilderness.
For Colorado, why not do the southern Colorado section of the CDT instead of the CT? While many sections of the two coincide, the CDT, I understand from my reading, stays more in the high country and is more in wilderness areas.
For that matter, the 80-some mile section of the CDT through Wyoming's Wind Rivers is awesome. There are many possible sidetrips that could use up most of a month, or you could hike on north through Yellowstone.