A skyblock currency to towny currency exchange if done correctly would promote playing skyblock as an additional way to make meebles. If done correctly, this would promote playing skyblock, and allow for another outlet of getting meebles that is more fun than just grinding jobs forever.
Edit: In the current skyblock economy I would suggest 10:1 Skybuck:Meeble despite the fact the meeble is more inflated than the Skybuck