At the moment you can only "downgrade" once, I would not be surprised if that is taken away as well.
Keep in mind that under the new rules they will force you to upgrade if you ever receive a credit card payment.
Perhaps your best option is to upgrade your exiasting account and open a new personal account.
Ben

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915
- answering Trolls is voluntary, my policy is not to participate.