My daughter be supporting me for the first 3 weeks, and my wife for the last 3. Its up to me to get from one to the other and I have only 8 weeks before I have to be back at work. If I don't finish, then I won't. Might have to go back and finish some time later in the year, but I don't want to start with that attitude.
My biggest concern for you was avoiding a medical emergency alone on the more remote sections that are lacking in services. Having someone along for the first three weeks might get you past the worst of that though. Of course it depends on your pace, but I didn't start out super fit at the start and hit San Antonio on day 21, so that may work out well for you.
Also the route starts out fairly hard and has some fairly tough sections, but on average I found it a route conducive to averaging a high daily mileage. I wound up doing way more 80, 90, and 100+ mile days than I usually do, so it might not be out of the question to finish in six weeks removing your need to go with no sag. If not, can you possibly have your wife sag for the first three weeks, your daughter for the second three weeks, and have no sag for the remainder? Or are you depending on your daughter for a ride home?
Finishing in eight weeks should be fairly easy if your daily pace is reasonable and you do not take a bunch of zero mile days and 6 weeks isn't out of the question. You only need to average 54 mile days to finish in 8 weeks and I personally would not ride this route if I didn't think I could manage that. The route, in my opinion is one where you want to be cranking out miles. There just isn't much in the way of distractions and services are widely space at times, so it just isn't the type of route where I would be likely to dilly dally much. Of course YMMV.