Chamaecyparis soil type question
 

I have recently bought a Chamaecparis thyoides tree to train as a bonsai. I
have just a question about soil types.

I had a look at the BCI species guide and read that Chamaecyparis are lime
hating. So, could I use a potting mix specifically made for azaleas for the
Chamaecyparis? I presume I could, however it doesn't drain that well, so
how could I make it more free draining (which I've read Chamaecyparis like
also)?

Thanks in advance,

Tony Charles