Another nice version is to hike into Mammoth Lakes via Red’s Meadow, and then after your zero days, hike back in via Duck’s Pass. The way in to ML isn’t too interesting, but it’s easy. The way back to the JMT is spectacular. The JMT miles you miss are, IMO, the least interesting part of the whole trail.
You get to keep walking, take your zeros, see as good or better scenery, and connect your steps.
There are lots of other options though, and of the few i’ve experienced, i’ve come to the conclusion that you can’t go wrong. All the connector trails are interesting. All the towns are worthwhile.
markv