I think you can use some form of auger to keep a hopper filled automaticly, or to fill a hopper with manual on/off switches. But the cost of the auger shown on the AHS site is very high.
If you are creative, and can fabricate braces, brackets, and lower feed hopper for the feed of the auger, electronic sensors to tell it when to feed, and when to stop,, etc.. Then it would be an interesting 'science experiment'. I guess it would depend on whether you felt the outlay of time and money would be worth the labor savings.
I have a section of 6" corn/bean auger that I may try to rig up to feed my hopper for the AA260 boiler.. I'm filling it weekly with 1500# of pea size coal.. That's 40+ 5 gallon buckets at ~35# each, all lifted up to shoulder height... If my shoulders or elbows give out, I'll HAVE TO figure out some loading system that is less muscle and tendon dependant.
Maybe it will be a hinged section in the roof over the hopper with a funnel arrangement so I can load it with my tractor front-end loader. ???
An auger system can be made to work, but may not be worth the effort or cost.