To be honest it seems like you're trying to fit 10 pounds of goods into a 5 pound bag. For you and your raid groups progressiveness (is this a word?) I suggest some one else should take care of SMN if it's truely needed. Depending on the turn you need this for (I'm guessing either T8 or 9) you're going to need every bit of DPS and MP conservation you can muster for extremely tight DPS checks. Splitting your stats like that already hinders both jobs, and now you want to hinder a role in the static even more by running with a subpar weapon.

TL;DR- Ask another raid member to gear SMN, or Levi book and mirror is your "best" option.