If you don't like the I Ching and its binary system, you can create other systems based on any other number.
For example, if you like these numbers:
3 (basic trinity)
5 (Greek elements + spirit)
7 (the seven colors of the rainbow)
12 (twelve signs of zodiac)
13 (the lucky number of those who don't consider it to be unlucky)
21 (number of letters of the Enochian alphabet)
22 (number of letters of the Hebrew alphabet)
42 (the answer to life, the universe, and everything)
You can assign meanings (or draw parallels) between your new system and the appropriate levels of I Ching.
3 = 1 + 2
1 + 4
7 = 1 + 2 + 4
12 = 4 + 8
13 = 1 + 4 + 8
21 = 1 + 4 + 16
22 = 2 + 4 + 16
42 = 2 + 8 + 32
So, for example, for a system consisting of 7 'somethings', we would use the meanings associated with the zerogram, the monograms, and the digrams.
It is interesting to compare one magical system to another.
In the case of Enochian, which is a language with 21 letters, it seems convenient to skip the monograms and trigrams.
In the extended I Ching system, we can take different types of gram to signify a level jump, whereas in Enochian all letters are 'equal'.
By choosing every other level for symbol meanings, this way we could 'hard-wire' level jumping ability into the system.
The same goes for Hebrew, except that its level jumps seem less symmetric.
The extended I Ching with its binary basis seems to flow clearly and serve well as the lowest common denominator for various magical systems in use.