[Sashimister]

I'll just mention something no one has yet, and that is how Japanese 1st-graders learn to write katakana. They don't learn it by writing only loanwords in it but they do so by writing everything in it. They are asked to write whole sentences and sometimes even whole passages in katakana. In other words, complete immersion is what I'm referring to. We all do the same thing with hiragana at one point in our Japanese study, so why not do it with katakana for a few weeks?

If you're going アイウエオカキクケコ・・・・ all the time, it won't be nearly as effective IMHO. Take it from the former Japanese 1st-grader.