Overall I'm pretty confused and less and less sure about the product you are willing to offer.
At worst, if you already do own a seller account, just go ahead and propose your product for approval and we will see what to do with it after testing during the review process.
If you do not have a seller account yet, consider possibly sending a working copy of your demo to scirra's support and you'll get a definitive answer from there as to whether it would fit in the store and/or arcade.