[libreoffice-l10n] Develop hyphenation extension

Dear list members,

I'd like to create a hyphenation dictionary for Church Slavonic
(Church Slavic), ISO code CU. I have ported the existing TeX patterns
using the instructions here:
https://wiki.openoffice.org/wiki/Documentation/SL/Using_TeX_hyphenation_patterns_in_OpenOffice.org

(are these the correct instructions to use? I have not found anything newer.)

Now, it's not clear to me what I need to do with the resulting .dic
file. The documentation says I need to bundle it as a Dictionary
Extension. But is there documentation on how that needs to be done?
After some digging around, I found this:
https://wiki.openoffice.org/wiki/Extension_Dictionaries

But it doesn't really say what to do. It just gives some XML code.
Some guidance would be appreciated!

Second question. The character commonly used in Church Slavonic for
hyphenation is the underscore, not the hyphen (e.g., hyphe_nation). In
TeX, I can simply set the hyphenchar to be _. Is this possible in
LibreOffice? If yes, where do I specify it?

Thank you for your help!

Aleksandr

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