Good lesson. I ought to do something like this at the beginning of the year in March. It brings up a lot of interesting points about English, although I will have to simplify things for my middle school students.
Today I was going to do the Konglish test, but we ran out of time. I put them into groups of 7 or 8 and handed them a sheet of paper with "A, B, C, D" etc., and had them write between 1 and 5 English words that appear in Korean for each letter of the alphabet. It was the last class, and I was pretty liberal with it: S-line, shampoo, sharp were all okay in my book, because they constitute English words appearing in Korean. I gave them 15 minutes, then awarded one point for each word. They got an extra point if it was spelled right. At the end of the class I had the students choose one word from each letter that they thought the other groups didn't come up with, and I awarded extra points if those words were unique.
Last night I was bored and so I did the activity myself. I came up with about 350 words that fit in that broad category of English in Korean. It's interesting to see, and to show students, how big of a vocabulary they already have. (If they'd just use those words properly). With more time it'd be great to get into other aspects of your lesson, so I'm gonna try it next semester.
edit: the above doesn't really fit your lesson of teaching the kids the different types of Konglish . . . just thought I'd share.
edit 2: Uploaded the blank A-Z list that I've used.