I used a similar method when I wanted to improve my touch typing. I did learn typing in school, but I still found myself constantly looking at the keyboard. This was way back in the PS/2 keyboard days and I had one of the ubiquitous Model M keyboards. The caps were removable with a butter knife, but I didn't like typing on capless keys.

What I did was rearrange the letters. I left all the symbol and special keys alone, but moved the letters, leaving only the F/J index keys in place. Now looking at the keyboard became counterproductive. If I ended up forgetting where a letter was, I would have to watch the screen and try different finger movements till I found it.