The distinct odor you notice when you open the Mikey Box after operation is not harmful.
UV germicidal irradiation basically zaps everything in the chamber that the light touches. Dust in the air is zapped too. A high percentage of dust (~80%) is actually aerial "rafts" of human skin. What you're smelling are the volatile organic compounds released after dust has been irradiated. It is not harmful and can be reduced by airing out the N95 filtering facial respirator for a few minutes before use.
220 volt lamp kits in 11w and 18w configurations from REMIX are a special order item. They build them to order and the minimum order size is fifty (50) units. Lead time is 10-14 weeks. It may be easier to locate another lighting vendor that can source the special ballast to run UVC lamps.
If you use two 18w lamp units in version 2.3 instead of 18w and 11w, then degradation of the spun polypropylene material of the N95 FFR will occur sooner. See Heimbuch et al for max permissible cumulative irradiance.