Caved
I just did the search/replace dance again, this time replacing those “invalid bytes” with numeric entities… for consistency’s sake. If Kung–Log is demanding to encode my Unicode characters as numeric entities, and Movable Type just don’t know what to do with ‘em then I guess I’ll have to use ‘em for now. I just really, really, really didn’t want to leave certain characters on the page unreadable; and I sure as hell didn’t want to leave the page invalid.
I’m sure some good will come of all this.