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I don't know if it will work but should. Get acrylic glue and let it capillary into the cracks. Glue for clear plastic. Then buff the lens. My brother buffed his lens and removed the DOT lettering. They look better and don't have any dirt or wax on them.
The buffing is done with a buffing wheel and compound for plastic.
Two of my four are cracked. It's been a year and a half now and I just don't see the need to replace them for a while yet. Not noticeable unless you look real close and the cracks don't collect any crud. It's on my list of things to do though