No you can’t get a Subscription with Bnet Balance. We have never been able to do that. They prefer more formal payment methods (CC, PayPal, Debit Card). If you scroll up a bit I have a chart with all the current game time options and also the payment options for each.
Or you can just look at this post instead - it actually formats correctly in threads without a blue post. Subscriptions are not changing - #90 by Mirasol-mannoroth