Won't work.Exporter will rename the extra muzzlepoint bone.I tried it myself.
Hm weird because I know Satrofortress did it once but im not sure what model.
Or, you can make an empty akimbo weapon, put the muzzlePoint on that so it lines up with the other one, then set the script so it fires both at the same time.
A bit too complicated for a simple problem, isn't it?