Mike...
As far as starting seeds to get a couple leaves for potting up... almost anything can do. Some people use straight peat all the time.
It's the grow out that matters. I have used reclaimed flower mix from old pots that I sterilized in the oven and then rejuvinated with some house plant food. Your worm compost soumds promising. It should contain the magic the otherwise and relatively barren materials you mention may lack. If I had to take a stab....
3 parts coconut fibers (chopped up)
1 part rice hulls
1/2 part worm compost
1/4 part vermiculite.
The charring or the rice hulls you mention may well make some carbon more available. Once it's all mixed you should be able to pour/shake it from a container. If you can then you probably have the coconut fiber chopped fine enough. Be sure to premoisten it before putting into your containers.
I wouldn't wait around till you need it though. Try it with some "seed o plenty" right away so you will know what you've got.
Keep us posted... and best of luck!
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