Hi David, I am not proficient in the rwm either, but I know that back-meta can be configured with its own rewrite engine, and it can definitely be configured to rewrite results. You could move this config in the database definition (without "overlay rwm"), and use rewriteContext searchResult to rewrite the search results. I haven't tested this myself in ages, but I hope it works in your case, there's a lot of examples in the slapd-meta man page.
Best Regards, Nadya