The brainwave I had was to give it a logic. The simplest is to drop consonants inside of the vowels, something pretty easy with some of the vowel symbols and difficult or impossible with others. So I've been coming up with other vowel symbols for the difficult ones, and simpler consonants to fit inside. But coming up with symbols that match the style of the existing characters and look good AND fit, is difficult. I have the vowels figured out, now I'm working on the consonants.
Once it's done, I'll have fewer characters to remember, and a lot more flexibility.