I don't have a clear 22 day or even a n-day plan yet, but I usually throw ideas into a file to save them for later.
I also have created a GMAP link for myself where I show a collection of possible routes on it, so you can zoom in and take a look at what could be used in a certain area as JMT alternate, then compare with the text file to see what these alternate routes involve (I saved links to trip reports, photos when available)
my compiled alternate route map link It's pretty much a work in progress and a compilation of things I've considered for many years, working on what would be my own version of "high route" with emphasis on staying off the busy JMT in areas where I usually don't deviate (mostly south). Many of these routes involve advanced route finding skills and class 2 and sometimes even class 3 terrain, but rarely the latter. I try to avoid that when moving with big packs. Much of it is Sierra High Route terrain, so there's a lot of info out there about these parts. Other times it's just a matter of finding old or barely existing trails like Junction Pass or the downhill from Carillon to the Mountaineer's Route
In the end, I probably will put together a trip that will focus on the safer routes that are off JMT, and on routes that allow easy return to JMT and familiar terrain should the weather turn nasty. If anyone wants more info on some segments on that map, ask and I'll dig up some of the info I saved about all these segments.