Yes, it’s a mishmash. I learned Bau Pau Mau in Taiwan, if you know what that is. It is an exact phonetic, more precise than either Wade Giles or Pinyin. There was another system created by the great Lin Yutang but never caught on. It had to do with doubling vowels according to tone. What is your knowledge of Chinese?
Yeah, bopomofo.
I never learned the phonetic symbols.
I know some Chinese is all. Not fluent. I can speak some things well enough to make people think I can speak Chinese, that just gets me responses I can’t understand.
My wife is from Taiwan and I learned from reading and using the character dictionary counting strokes and from many friends I worked with from China and Taiwan.
There is a name for the romanization you used, but the name slips my mind right now.