Start Hanja Script language for Korean
And it's strange that this wiki, actually uses all Korean scripts (including Hangul) everywhere in the content (I'm not speaking about the interface of the wiki itself)... So this wiki actually uses [ko-Kore] even if they want to remove Hangul (as much as possible) in favor of Hanja (I'm not really sure this is possible in modern use, unless you accept to borrow Chinese sinograms, most probably in their simplified in modern terminologies, but possibly traditional for coherence with Hanja; not sure that users will be able to read these borrowed Han sinograms, when they also are composed with phonologic traits which are appropriate to Mandarin, but most probably not for Korean).
Do you want to be inventive and create adhoc Hanjas, composed by a traditional Hanja radical and an Hangul part to replace the phonetic parts of Han sinograms? You won't be able to compose them in Unicode, so you'll fallback to use Hangul only (or maybe Latin or Cyrillic): Hangul is more complete than the basic alphabet and has many adhoc Jamos (plus a few diacritics) to compose more complex and more precise clusters that better respect the phonetic than modern Hangul which has simplified the phonology by reducing the number of jamos (the other ones being kept for historic use and encoded in Unicode even if they are not precomposable in a full syllable using a single Unicode character).
Note that Unicode contains a few clusters that don't respect the pure (L*V*T*) Hangul composition of jamos, just like Japanese has some precomposed clusters of kanas (possibly mixed with Latin, e.g. for international measurement units), and some adhoc Hanjas specific to Korean (not used in Chinese languages, Japanese, or historic Vietnamian).