Interesting reading. Firstly I have to say I think the no blood transfusion ban should be lifted however I dont know wether I agree with your final interpretation of this account ie no penalty.
So obviously there are circumstances wherein abusing blood carries no penalty. We deduce from this account that such circumstances are when the abuse of blood is for the purpose of saving or protecting life.
If there was nothing wrong or no penalty how do you explain these verses?:
34 After that Saul said: Scatter among the people, and you must say to them, 'Bring near to me, each one of you, his bull and, each one, his sheep, and you must do the slaughtering in this place and the eating, and you must not sin against Jehovah by eating along with the blood.' Accordingly all the people brought near each one his bull that was in his hand that night and did the slaughtering there.
35 And Saul proceeded to build an altar to Jehovah. With it he started altar building to Jehovah.
Are not those verses explaining what happened because the people were "eating along with the blood"? Were they making atonement for their sin? I dont know, I'm just saying it could mean that and if it did that would hardly prove they could take blood without penalty as it was still a sin.
Let me reiterate I do not support banning blood transfusion im just saying I'm not sure this proves what your trying to say it does.