It's pretty much confirmed that VC G/S will not have Korean games (no announcement for korea), thus is there really a need to have it incorporated to PKHeX? There'd be a lot of required things:
Different character table (strings)
Different item/species/etc names (strings)
Prevention of loading to VC1/Gen7 games
Mixing in a 3rd set of offsets
Korean G/S would be locked to itself, so I don't see a need to support it in the multi-game editor (pkhex). Maybe a separate program / fork of PKHeX is best? Korean G/S is essentially a rom hack