I've checked with a few of my industrial suppliers, and scanned a bunch of supplier listings like ***, INA & SKF... the sealed versions do exist, as well as greasable and heavy-duty, but almost all are with 15 or 17mm IDs, or the 16mm ID with a 30mm or 28mm OD. One of the better manufacturers, Schaeffler, has one for $320, so I would defer to looking at load ratings to compare. The problem is that the "self-lubricating" PTFE-lined ones that come on the bike don't handle nearly the load that an all metal one can, it would just need a good packing of waterproof grease at install. If there is a possibility of turning down the pivot pin, or milling out the bearing bore, you might be able to install one that would never fail again.
I've made a living out of re-engineering OEM parts over to stronger/cheaper/easier to source on industrial equipment from all over the world.. this would be no different. Sometimes production limitations overrule smart applications and these kind of simple failures are the result. There is always a better way. My limit for repairing something is twice before I try something different- what's that quote: "the definition of crazy is doing the same thing over and over and expecting a different result"
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