How long are you getting out of your chains now? My last one did 2 years of on road and a year of off road all year round commuting. I only changed the chain as a precaution and the current one is around 16 months old and is still running fine despite never having been given more than a wipe over and a spray of GT85. I take no notice of chain wear,I just reversed the chainring and replaced the rear sprocket when I changed the chain. I could have reversed the sprocket but chose not to as I thought it better to avoid running what had become a worn and slightly pitted surface against the oil seal although I know others have done this without problems.
Personally I think adding another thing that mud can clog up will have more drawbacks than advantages.