Is it okay to drink a nonalcoholic beer while taking .5 mg klonopin (clonazepam) 2x day? i know there is a very small amount of alcohol in them.

Safe: the amount of alcohol in non-alcoholic is negligible. should be fine. be safe.

Not OK in any amount: Adding any amount of alcohol to any amount of medication, especially those which suppress nervous system function (e.g. Klonopin) is never something a doctor'd ever find acceptable. Most important reason? It's dangerous. Consequences such as respiratory depression, coma, and death occur daily.