With that soul stone are you able to transfer skills between different accounts?
Unless it was modified and someone can verify it, no. Soulstones only work for the same account. So it can't be used for cross-account skill swapping. I think it's a good idea to keep it that way, as it diverts people from making a million accounts to make characters with skillballs to transfer them all over. Just wait 7 days and delete one of your alts and make a new one.