Crickets are not caused by ethanol. Also, the fuel manufacturer should be able to tell you about splash blending and weather or not there are potential issues with doing so. There are some other high octane additives designed for blending like
Torco Accelerator that would be easier and probably less expensive in the long run, though not sure on the chemical properties of the Torco, i had planned to buy a case and do a 100 octane tune but switched to E85 instead.