If you are using PrecApr, could you get into ET with something like Warlock4/Wizard1/ET? You only need 5 levels to satisfy the skills for ET, and Warlock 4 gets you a Lesser Invocation and at least 2d6 EB, IIRC.

That has you only losing 2 BAB to get in, and gives you far better casting than Suel would. Don't get me wrong, I love Suel, but it doesn't fit well here.

If all else fails, it is a bit expensive, but Warlocks get UMD, so you could get a wand of Divine Powah for really big fights.