" the mention of blood at Acts 15 was a reiteration of the prohibition against eating it in the Law. "
And that destroys any argument that the Prohibition is about Transfusions. Thanks TD, couldn't be more concise.
And if you understand and acknowledge the context of Acts 15, any JW would have to be honest and say this advice was for 1st Century Christians, where fully practicing Orthodox Jewish people, who were also Christians, had fellowship with Gentile Christians. That situation never happens today.