Will "chante to..." skills benefit from synergies?

[jeckwild]

If I use Bonehew ogre axe, it'll give me 50% chance to shoot bonespear slvl16 on striking.
Well, it will be probably the silliest necro I will ever make - the one who swings an ogre axe around - but if I have all the synergies maxed out, it might be quite an addition to the base damage?

Now if it does, will it also work for my act2 merc? If so, it would be the best polearm weapon for bonemancer's merc, right?

Thanks in advance!