Customising z-wave device channels

Yes.
General outline

  1. Remove UI Zwave binding - Don’t want two running
  2. In karaf feature:install openhab-transport-serial - Needed in most systems, normally installed by UI
  3. Download and place jar in addons (same folder as the openhab-addons-3.3.0.kar)
  4. wait 30 seconds
  5. Delete Thing from the device UI page (do not exclude device from controller page)
  6. Go to inbox zwave scan to pick up new channels

Assuming you are on OH3.3 there should be no problem