EDIT: As brought up in a later discussion for future readers, smart bulb mode + multi-way control + dumb switches may not work and my assumptions and advice on this may be faulty.
Original post:
Yes, it should dim your Zigbee bulbs from the switch provided it is bound to the bulb or group of bulbs.
As far as getting Aux switches, it depends on if you want dimming at all locations on that circuit, but otherwise it shouldn’t matter if you have dumb switches in the circuit, you will just need to make sure the Dimmer is on the Line side of the circuit and you also need to make sure you have a neutral available.
As it will be in “smart bulb” mode, the bulb will be powered on full time, and the switch will send commands to the bulb over the zigbee network, so a press and hold from the Dimmer should work without issue.