Why not amend the constitution to read the following?
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This would get rid of the automated de-registration at six months and allow the Registrar General to de-register people after they missed three consecutive federal elections (including the irregular elections). Normally when people miss three federal elections, they've lost interest in the game, and should not be on the rolls. And in the rare instances where that's not the case, such as the de-registration of Nathan, the said voter can simply re-register. It's not a difficult concept.
I'm not sure why people want to keep hordes of inactive voters on the rolls months after they've lost interest if possible to remove them earlier. That was the case when when we had 180/190 voters only a few months ago. Due to Homely's lawful actions, we now have a much more realistic, cleaned-up list of 146 voters, the vast majority of who are active.