Expanse was just added to the Ledger Wallet and will be unveiling Tokenlab in the coming months. This will allow companies to launch a token on the Expanse platform. In the beginning, EXP will be required to purchase into the Tokenlab crowd sale. Adding EXP to Bisq would be a great addition!

Check this thread out https://forum.bisq.io/t/how-to-add-your-favorite-altcoin/46
You will need a java developer to make a pull request for address validation in Bisq.