I've heard they start well on corrugated cardboard, better than molds--which means you could potentially skip the agar step... maybe worth a try if you have a few extra CCs of spore solution.
If you go with PF style jars make them with grain, cardboard, and hardwood chips instead of vermiculite and brown rice flour.
A possibility for spawn jars comes from The Mushroom Cultivator...
Sawdust/Bran Spawn
4 parts sawdust (hardwood)
1 part bran (rice or wheat)
Soak the sawdust in water for a least
twenty four hours, allow to drain and then
thoroughly mix in the bran. If the mixture has
the proper moisture content, a firm squeeze
results in a few drops between the fingers. Fill
the material firmly to the neck of the spawn
container (wide mouth). Japanese spawn
makers bore a 1/2 inch diameter hole down
the center of the media into which they later
insert their inoculum. Sterilize for 60-90 min-
utes at 15 psi. Once cooled, inoculate from
agar media, liquid emulsion, or grain. A fully
grown bottle of sawdust bran spawn can also
be used for further inoculations.
...I'd be concerned with the mix turning out too dense, but I suppose it depends on how fine the sawdust is.
A web search on "cultivation psilocybe azurescens cyanescens" gets lots of hits.
Good Luck
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