If you are unable to back off the adjusters, and even then are unable to free up the drum from the shoes (I take it you are saying the drum will not turn?) then what you could try is to unbolt the cylinder before pulling the drum. I am not up on the smaller brake systems, but if there are bottom anchors, or anchor pins, I would try and remove them at the back of the backing plate as well.
If the drum will turn, but just not back off, then use a bar or wooden handle (ie pick axe handle) on the wheel studs (protect the threads of course) and turn the drum while pulling the drum away from the hub. Again, whatever you can remove for the anchors may help remove the drum.
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