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I'd also suggest to throw in hit over haste if he is under cap (289/263 if Dranei).
Even as an Alliance non-draenei don't aim to go over the 262 hit cap, unless it's likely they'll frequently be raiding without a draenei. It's quite difficult to out-range the buff.
Otherwise, the meta gem an SP should use is the chaotic skyflare. It requires two blue gems - these should always be purified (i.e. SP + spirit). Similarly, leg armor kits should be brilliant spellthread (SP + spirit).
If it's worth filling a yellow gem slot with an orange gem (i.e. the bonus is a healthy amount of SP), my preference would be for a potent (SP + crit). It's unlikely that you won't have enough haste from gear alone for the MB -> MFx2 "rotation".
Otherwise yes, SP all the way.