Tsubaki and EK both make 525 o-ring chains with clip links. The EK525mvxz has a screw/nut master link option that's suppose to be as tough as riveted links. I don't know about that, but it would be easier to change on the road and could be more secure than a clip. But with a standard clip link at 0.69, and an o-ring clip link for about $3, and a screw link at about $13-$15 bucks, it might not be worth changing a screw link for a chain cleaning every 500 miles.
