Aside from seconding "ask your surgeon" (which you're going to do!), I personally was cautious about that sort of thing until the site was fully healed. It's hard to predict or control how much vibration will affect half-healed tissue.
That said, nothing at all stops you from trying a non-insertable vibe if you think *that* area is healed.

The first time I tried that post-op... wow. I gotta say, despite knowing it's the same or fewer nerve endings as before, I couldn't BELIEVE that fact anymore.