I can't believe that's not a thing that's been tried - with the coir. After I get my first isolate, that's experiment #1!
As another update, I popped open my LC box and the ATL and Mexicana LCs WENT WILD. These were inoculated on the 13th. When I last checked (I think it was this past Monday), there was no growth. Now there's a lot.. of SOMETHING in there. Double SHIP lids so it's unlikely anything got in there between the last time I looked and today. It looks good. I'll grow it out and make sure it's not a contaminant. Fingers crossed!