I can suggest some DIY options (not sure if they fit you):
a) build another OH2 instance (e.g. on an rPi3 with USB dongles on it) to act as the gateway to your main Docker OH2 instance. You can easily link the 2 OH2 instances with MQTT.
or
b) Use another rPi3 with Share Z-wave dongle over IP (USB over IP using ser2net / socat ) guide
c) Link The Dog with OH2 over MQTT
