I'm a pretty big fan of the Five-Love-Languages philosophy. So simple, and yet surprising, to realize that we have different ways of sending and receiving messages of love.
It sounds like there's some chance your wife may eventually be okay with the poly thing, which is good to hear. But I'm tempering my hopes because I know she's not quite there yet, and there's a chance she may hit a brick wall in that direction and not go any further.
I think you're wise to "not overdo" the talking about it, as that way your wife has more time to think about things before she has to respond to your requests about it. If you continue to talk to her about it a little now and then, that will probably suffice for the most part.
I'll keep my fingers crossed for you.
Love means never having to say, "Put down that meat cleaver!"