The deconz update thing is a bit of a mystery. I created a naming convention for the devices in deconz & tried to manually replicate that in HA if i was too slow to rename the deconz devices during initial setup. I also have a separate spreadsheet to keep track of the deconz name & the corresponding HA entitiy names.
You can disable the automatic addition of new devices in the integration config. This allows you to change names in deconz before they are added to HA.