Set different hyphenation character

[Aleksandr Andreev]

Is it possible to specify a different hyphenation character to be used? Some languages do not use U+2010 Hyphen for hyphenation (see script-specific hyphenation characters in Unicode). Church Slavic uses _ (U+005F Low Line) for hyphenation.

In TeX this can be done at the font selection level, e.g. \newfontfamily\myfont[Script=Cyrillic,HyphenChar=_]{My Font}