I think this one speaks for itself. I'm still working towards getting the mods and arcane, so this is a personal goal.
Swap the two basic elemental mods to switch the damage types around.
Likewise, swap out the Bane Mods accordingly.
If you do not have primed Bane Mods, use the standard bane mods for now (40k less damage) and save yourself a forma in the meantime if you want to. Otherwise, go ahead and throw the forma on there to get it ready. (it's not going to hurt it and this thing smokes in S.O.)