Bootstrap the normal cMnkUnarm, with a -4 in the effective level field (xEffectLev). Have a second eval script on the archetype which assigns Helper.DamageDown to the unarmed strike until you hit the first increase from monk levels. That way the normal special will assign 1d6 (since that is minimum, even if the -4 brings it to negative or less) until level 4 and your DamageDown bumps this to 1d4. At level 4 and up, you don't assign anything and the -4 means its always one step behind.
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