I've done it on the odd occasion mainly when I was younger
(and yes I am moderately self lube otherwise I agree it could be a problem). Without revealing way to much information I have both the ball type which just jiggle as you walk, and the powered type. In the right setting they can indeed be good fun.
My only comment is that work is certainly not the place. Such a thing sounds more fun than it actually is, as there comes a realisation that you are at work to be professional, and such an ongoing distraction is simply non appropriate. (and believe me it WAS a distraction)
As regards doing it newly postop that would definitely NOT be a good idea. Your new skin would still be too delicate. Also when you sit your internals move around a fair bit and the pressure that having such a thing inside whilst doing so could exert is considerable. A dilator has a very definite shape to it and the profile is actually part of the therapy, so an egg shaped or ball shaped insert would not really be a good substitute. Besides when you dilate you have to move and stretch things in a definite way.
On balance my advice is, later on when healed for social fun yes. Early on, as some kind of imagined substitute for dilation definitely not!
