I have been wondering if it would/could be possible to turn my AHS-WOC55,225k btu multi-fuel into a stoker or hopper feed boiler.
This used to be very common...hence the "Electric Furnace Man" and their lineup of conversion stokers. You would remove the grates and insert the stoker in through the ash door. Coal augered in, ash augered out...
Personally I think it would be a lot more cost effective option to sell your current boiler to someone who wanted to burn wood/bit coal and install a factory-build stoker boiler.