I’m assuming you have seperate wires for the light and fan. Since you already have smart bulbs, you can just wire the fan to the switch and leave the power to the bulbs hardwired on.
This jasco zwave switch will control the fan and set speeds. It has double and triple tap scenes where you can control the smart bulbs by double tapping the switch with an automation. You will need a zwave stick though.
Most other options are out of stock or require flashing. The sonoff ifan03 is a good option but needs flashing and a good amount of configuration. Someone put a nice blog together though about it.
There’s an ifan04 now too