Attempted the Dallas RTC mod for the first time and it did in fact work out pretty well.
It's a bit of a tight fit between the VRM holder and the BIOS chip, but still OK. Board is a Shuttle HOT-541.
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Now the board is ready to be used in a new build. I think I will use it with this 286 desktop case that I got with a Gigabyte Slot 1 AT board installed. Built like a tank, labelled "Privileg" (a brand used by German mailorder pioneer "Quelle"). I don't have any real use for such a system but it should be fun to build!
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