This might be more trouble than it’s worth (so feel free to ignore). I believe you can pummel it into submission with a process that would look something like this:
Cover the block of sugar with a cloth (a pillow case might work well) and beat it with a hammer until you feel it’s in relatively small chunks.
Pour the chunks into a collander and use a potato masher or ricer to “mash and crush and twirl.” The result might be something that comes close to granulated sugar. Your stress level will go down a bit, too ;-)