Burning bit coal in an unmodified
anthracite stoker means you'll have to look much farther than penn for your source. You'll need to burn a non-coking bituminous coal which will likely be sourced from KY or southern WV.
I've got one set up in plattsburgh, NY right now, burning KY bit for less $$/btu than anthracite.
From what you wrote there's more you don't understand about bit coal and stokers than you do. For example - "clinkers" aren't really any kind of an issue. The two biggest challenges you'll have is finding coal sized small enough to work in most anthracite style stokers and finding a non-coking bituminous coal in that size. The only virtues of using an anthracite style stoker are the ability to bin feed and producing loose ash - which is only an advantage if you plan on using an auger to remove it.
Finding bituminous stoker coal isn't hard, and neither is finding a bituminous specific stoker that will burn common higher coking tendency coals. With a clinkering type bituminous stoker you'll have to pull a compact hard clinker once or (when it's really cold) twice/day.
Bit coal is a perfectly "viable" option, but, it requires someone knowledgeable to set up the system and the equipment is more difficult to find, not that difficult, but, more difficult than anthracite equipment.
If I lived in NH, I'd do it in a heartbeat, but it is more difficult where anthracite is simple. Most importantly, unless you have a large space to heat/high load, you won't save much. It will require more work to get the system right (boiler/stoker combo) and it will be more of a novelty than a huge cost-saver.
Go a few posts down on this page and take a look at my project : Pictures Of Your Boiler