MagisterCultuum
Great Sage
That is a unit specific ability, not one that comes from a promotion, so it would not carry over to the golem. You would be throwing away your ability to capture barbarian units.
As I mentioned in a different (similar) thread, having three OO High Priests means one free size 13 flesh golem a turn (two Krakens + Graft Flesh). Or if you have a fully powered Barnaxus, a free size 20ish unit every turn. (or two, if your Inquisitors get in on the game). This strikes me as a bit too much.