Until a new merit source is chosen, and if you feel unfair in getting merits in your local board, create a topic in the Reputation or Beginners & Help section with a quote for posts that deserve merits, (make the topic self-moderated to avoid spam) I will bookmark that page and visit it from From time to time, and it will be a best place to choose a merit source in the future.
That's an interesting proposal. You are one of the few guys who want to merit local board posts. I don't remember seeing anyone except for fillippone, who intends to review local posts. There is a thread by Loyce to report unmerited good posts. But the limitation is he cannot review local posts as he doesn't understand other local languages! It will be challenging for you to evaluate good posts. But, if you rely on some established members who can review for you and submit the posts, this is great approach.