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If you do a search of Hydoleca from the search button, fourth from the left in the row of "butttons" near the top of this page - just under your profile picture, you will find references to mentions of growing in this medium. Several just refer to the use of hydroleca as a top-dressing for the posts. You can search for clay granules too and there are a few results for that too.There doesn't seem to be much in depth discussion.
Isn't the grain size too large? Lots of people use moler clay cat litter, if you can find that for sale.
Can you still get Seramis®?
Seramis £3.45 for three litres. Might work, but I am sure that I have heard people mention problems with using it. Possibly pH related?Perlite £7.55 for one hundred litres. Does work.Why complicate things? Surely Cypripediums are too expensive to be experimenting with.