Is it urgent, likely no in your case. It doesn't seem you have an major loss in power from a clogged converter or anything like that. If the code was constant you may notice a loss in fuel mileage though.

A univeral cat would require more labor, as it would have to be welded in and that takes time. It's likely less than 1hr labor to remove and replace the whole downpipe with converter. Heck if all the bolts came right out, less than 15min with a impact gun to do the whole thing.