Long time lurker turned regular here. (I finally got fed up with the low standards at the trains.com forums.)
Just a random thought, does anyone here think it would be possible to glue together scale coal into a preformed clump? Like, say you do a hack job on a tender that includes cutting the coal bunker to a shorter length. Instead of cutting the (bad looking) plastic coal load, why not glue a styrene sheet into the coal bunker to be the bottom of the bunker. (which, if deep/wide/long enough can have a speaker mounted in it) Then make a styrene mold, for lack of a better word, that you can pour scale coal into, (and here is the part I'm not sure of!) pour in some diluted white glue to glue the coal together into a clump that fits into the bunker. All the look of a live load, with a one step cleanup in the case of a derailment. In essence, it is a dead live load!
/Ramble
--Jake