Well, Fist of the Forest depends on how awful Primal Living affects you.
Since epic, I'd certainly suggest Planar Shepherd.
Sacred Fist has Unarmed Progression & Divine Spellcasting progression, no Wild Shape progression.
Monk Unarmed Strike damage increase stops at 20 effective levels, so with Superior Unarmed Strike feat & a Monk's Belt, you could probably get close to capping out without too many class levels of progression. You have Improved Natural Attack (Unarmed Strike) to give it one last boost.
If you want to avoid putting yourself at toe-to-toe risk, you've got plenty of levels to make a
Wizard/Druid/Arcane Heirophant
ShapeChange / Share Spells and send your Companion-Familiar in to do the heavy lifting, or ride it.