That... actually looks pretty solid.
Given you might want to go first to get some Luck/dice effects off, maybe grab Improved Initiative? Divine Interference Might be useful but unsure if you'll have the needed spells to burn. Split Hex is also pretty handy BUT it's Witch only. Given the fact Shaman is part Witch, talk to your GM about what you can actually qualify for.
Final bit is Flexible Hex which lets you as a Swift action swap your Wandering Spirit. This is great as you can swap into some Benefit of Wisdom to use WIS instead of INT, and then swap back to Arcane Enlightenment to relearn/pick your wizard spells.
I, TRIED, to do this gimmick build/idea but I also played in Iron Gods where my spell/hex list wasn't... very up to par(Cough, resist mind effects, cough). I hope your run goes better in Crimson Throne.
I quite like this concept. If you can reliably make the DCs then I suggest looking into the Ritual Hex feat. It gives you some more flexibility with your hexes; letting you utilise some of the more niche options or 'try before you buy'. In theory if you didn't take Witch Hex - Protective Luck it would allow the 'Witch Hex' hex to be an available option for Ritual Hex thus allowing you to pick a different temporary witch hex each day.
Hmm interesting build, makes me wonder if it can be made into a reach build but looks pretty tight. Of course it isn't allowed in PFS...sigh
The idea would be based off the reach cleric guide. Basically during your turn you would do your normal thing and you could act during the opponent's turn fishing for attacks of opp. You would need a longspear, combat reflexes, power attack and most say 14 str. It is a nice idea to add some damage. But the problem becomes getting the stats to line up
Quick thoughts on Prestige Classes.
Fateful channel really fits the build - and requires a death deity/Pharasma - but if you can give that up and change your deity to Pulura - the stargazer prestige class is amazing for almost any shaman and more so for one that leans more towards cleric/channeling
If sticking with Pharasma (N deity) check out Envoy of Balance - esp: twinned channeling endowment: This might make it attractive to try to get a level of cleric with the Undead subdomain as it's death's kiss power can let you negative energy heal living party members- so you can twin negative energy heal and harm and include/exclude the right beings with Selective Channeling.
Evangalist is almost always good and Pharasma's obedience is a reasonable one. This would probably add these three feats: Deific Obedience, Favored Prestige Class, Prestigious Spellcaster