Forgive me if I'm missing something in the technical ins and outs, but would the Unicode replacement be able to arrange hieroglyphs in vertical groups the way WikiHiero can? Trying to look it up via Google turns up this discussion on Stackexchange from two years ago, which seems to indicate that at that time it was technically possible to do it using Hieroglyph Format Controls, but the respondents weren't sure that that there was any system able to implement them.