Starting at glacier point you could loop over red peak pass going over the Clark range and then on to either Toulumne Meadows, or take the cut off to Lyell valley about 6 or so mile from Donahue pass if you don't want/need to stop at Toulumne M. for resupply. That route should be spectacular! The u-shaped chain of mountains you will find yourself in on the far side, from mt. Lyell to to mt. Clark is in fact the primary basin where the glacier that created Yosemite valley came from.
Also you should very rapidly get away from most of the crowds that way. That is one alternate start to the JMT.
When I do it this year I will start at White Wolf and go through the "grand canyon" of the Toulumne – none the less fun for having been there before – and connect of with the "real" JMT at TM.
If you are more ambitious and want to try some of the high sierra route you could go from red peak pass over the "gap" between Mt Lyell Forester peak, and then on to the JMT, roughly in the area of 1000 island lake – Id have to look it up again to be sure – its in roper. I have not done that, nor would I probably have the balls to try to solo.
Along that route I seriously doubt you would have cause to worry (at least for the first half of your trip) that you are missing the grandeur of the southern part of the JMT.