regarding no 2. Nope, that's wrong.

On a korean keyboard, the right side of the keyboard are ALL vowels, and the left side all consonants. https://grrrltraveler.com/wp-content/uploads/2013/03/hangul-keyboard.jpg

Using KEK on a Korean keyboard would yield ㅏ다 which firstly, is impossible the first character is sounds like "ah" the second is a combination of "t/d" and "ah". so if written correctly, you'd read it "ah-dah"

But you cannot write Korean vowels without a preceding consonant or place holding silent consonant. e.g. 아다

We might note that Korean does have its own set of imojis, tho.

Eg. ㅇㅜ ㄴ Bowing person, (head, hands bent on knees)

If you write kek in Korean (phonetically) you get 켁 ("kek").