Mojca, you asked me some times ago about a modification of the loadhyph-xx.tex files to take into account the modifications for LuaTeX. Here is an example for french (not really tested I must admit), is this the kind of things you want? Should we provide a fallback mechanism, like for example a macro \UseOldHyphMechanismForLuaTeX that, if defined, will make loadhyph-fr.tex simply load hyph-fr.tex instead of using the new mechanism?
Thank you, -- Elie
loadhyph-fr.tex
Description: TeX document
