ONLY available as paper pass which needs more as 1 month to be sent out to your home-probably even longer.
ONLY, ONLY available on 2 distinct ferry-comp and again: check yourself is these can provide your esteemed standard or are you willing to compromise for a few € discount?
WE here are just some experienced travellers (though I myself am not fond on GR at all) trying to help the usual newbee standard questions-and delight on interesting difficult questions-not lazyness. THis is thus not some company going out of its way to woo new clients in.
Moderator addition: All information can be found in the Greek Island Pass guide
https://www.interrail.eu/content/dam/pdfs/greek-islands-pass-guide.pdf
https://www.eurail.com/content/dam/pdfs/greek-islands-pass-guide.pdf
WoW! Very kind! Thanks for your help!