Now that I think about it some more, I'd just use the Hi Welcome build, level 6 version.
+17 to hit base + 2 charging + 4 or 5 bard song + any other bonuses (Bull's Strength pre battle, Nature's Favor or Divine Favor via that MIC belt) = +27 or +28 to hit. None of them have anything special for AC.
Damage bonus is 12 or 6 + 4 or 5 bard song + the same other bonuses = 20-21 or 14-15 added to 1d8 dealt 5 times along with 3 DC 21 saves vs dex poison, a trip at +16, and a grapple at +22. All together that's 5d8+102 (5 more on 2nd and subsequent rounds, more with more buffs). Should be an easy one rounder. If it isn't you can drop to hit by up to 6 to get 5 damage a point... and this is without doing things like giving the Fleshraker Leap Attack.
They can get out of this one by invoking Pathfailure rules (which makes trip and grapple stop working, and poison suck) but that's the only way out. And ya know, they're still kinda dead.
Nothing says I'm better than you like a dinosaur eating your face.
If for some reason they actually get to attack, the dino has an AC of 34 (32 if charging) without buffs and more with them. The Druid atop him is a bit worse off. 23 without buffs (this number can significantly improve). Even so their damage is fail enough you can take a few rounds of it and Lesser Vigor afterwards. The Druid that is. His little friend has more than double his HP.
And what templates are you looking at?