Doubt you could do any damage to a BOW that big, unless A] your primary forage is some type of fusiform prey such as YP or GSH, AND B]you were fortunate enough to have the WE pull off a spawn--OR C] financially blessed enough that you could afford to stock hundreds of WE big enough to escape predation by 6-10lb LMB. They're not cheap at that size.

If you just added a few dozen WE, I doubt you'd notice any change at all, if your pond is a mix of BG, YP, LMB and crappie, though you might see a tendency for the WE to prefer juvenile YP as their primary forage.