Are you sure your cree bulbs were connected to a pico remote? It’s far more likely that they were connected to the “Lutron connected bulb remote” (LCBR) a now discontinued device that looks something like a pico, but actually operates on an entirely different frequency. It would not work with a Lutron bridge, for example.
In any case, there are several devices that would meet your criteria, and then the wall mount switch communicates to the hub and the hub communicates to the Cree bulbs. So that part is easy.
As far as one that looks like a rocker switch, there are only a couple of those. See the following thread (this is a clickable link)
Another option would be to buy a Phillips Hue bridge. You could connect your Cree bulbs to that bridge which would allow you to still use your connected bulb remotes. Then you would connect your Hue bridge to Smartthings to have control both ways.