It would probably be enough if you just made it so they didn't suffer from the -4 to defense from light spear since they do infact have a side arm. That by itself would make them better as a spearman. That -4 defense really makes hoplites melt vs anything with AP or high lethality or fast attack animation. You could also stick like a +1 to attack or defense or something to differentiate them from spearmen who don't have a secondary(and therefore would suffer in CQB).