I bought a house where there is a 'smart' doorbell installed, and it is powered from a DC wallwart that is plugged into the mains on the floor above. The mains receptacle for this power supply is in a split voltage box with high-voltage (HV) on one side and open-back LV on the other side. The LV line running back down to the doorbell was installed during construction and won't be easily moved, so the HV to LV interface has to happen in the location of this box. The previous homeowner had the wallwart plugged into the 120v receptacle and the output snaked back into the LV side - image below. Are there code compliant, or at least safe, in-wall/in-box power supplies that can tidy this up so it's all behind a wall plate? Legrand have a Wattstopper series of plenum-rated power packs, relays, controllers that mount through a knockout in a line voltage box. If I can find one of their devices that steps the voltage down sufficiently for the doorbell, is there any reason such a setup would not be code compliant? (Doorbell can take 8-24v DC or AC). Thanks in advance.