Spanish 21 and Double Attack Blackjack

Has anyone found a workable count for Spanish 21? I have only found one book on the topic, Armada Strategies for Spanish 21, but it only describes proper basic strategy.

Also, I saw a new game called Double Attack Blackjack that seemed to have some possibilities for counting. Anybody heard of this game? Is there a basic strategy, and is it countable?

I know both these games were designed to overcome the APs advantage in blackjack, but that still doesn't mean they are unbeatable.