I'd just ditch the stealth idea from the start. It doesn't help down there except at the end. And there you have other abilities (invisibility) which are just as useful.
What you need is the ability to heal from a great distance (magery), the ability to keep yourself in the mana (meditation) and the ability to do a whole lot of damage in one shot once the ninja, assassins and mages pop out at the end (spellweaving). The only one of those skills that HAS to be at 120 is spellweaving (one failure in word of death means you might have to deal with twice as much side-spawn)
And of course, you need as much taming and lore as you think you need for controlling your dragon (or cu if you're feeling adventurous).
So that puts you at:
120 weaving
110 taming
110 lore
100 magery (more is better)
100 meditation (more or less)
which leaves you enough room for one or two more skills. Since you are a tamer, vet could be useful, but if you only plan on fighting Travesty, it isn't mandatory unless you also use your tamer for key collecting. I would include vet on the template.
That leaves you with either points for another skill (EI preferred) or to bring the rest of your template up to all 120's.
Now the secret to killing Travesty solo on a tamer is to not let Travesty polymorph into you. This is best accomplished by staying far away from Travesty. If you run in, "all kill" Travesty, run away and invis yourself, then odds are pretty good that she won't turn into you. Then you can approach your dragon one step at a time until you're close enough to heal your dragon, but far enough away from Travesty that she won't turn into you. That means you can't use offensive magic against her, but it's safest that way.
Once she turns into you, she also gains the benifit of your resists, which more often than not means the fight will take much longer. She'll also keep attacking you, which means you'll be running away and your dragon will be chasing for the entire fight, adding even more time.
Near the end of the fight, the mage, ninja, thief and assassin attack, at which point you need to run to wherever Travesty is and cast a single word of death before running away again. It would be best if you can get all of the side-spawn to follow you. Then you can invis yourself far away from where your dragon is fighting Travesty and you can run back and WoD Travesty to death (doesn't matter if she turns into you at that point) while saving the side spawn for later. If the spawn attacks your dragon, then you might have trouble healing the dragon quickly enough and you still can't afford to let the dragon off of Travesty. This is the part where having EI (or archery or a mage weapon bow with spell channeling) can come in handy. You can pick off the side spawn from a distance while your dragon stays on Travesty and hopefully you can kill them fast enough that your dragon won't die.
The whole process can take anywhere from half an hour (if your dragon has high tactics and wrestling) to an hour (if your dragon is like mine and has low tactics, my last run took about 50 minutes).
