Unfortunately, nobody has responded to my question, yet. This thing is, I accidently sent a few ERC20 tokens to this address and I am wondering if there is an< chance to get access to these tokens. It would be great if there would be an option in the Waves client to export the private keys of all supported altcoins so that one could import the coins in a altcoin native client.
This would be fantastic but I'm not sure if there is currently any technology that allows it in an easy way because there is no direct link between different blockchains. Atomic swaps are what I think you are talking about. You can read more here:
https://bitcoinmagazine.com/articles/atomic-swaps-how-the-lightning-network-extends-to-altcoins-1484157052/