1) there have NOT been "thousands" who have died from refusal of blood transfusions. There are less than 500 deaths recorded of jw's refusing blood, WORLD WIDE over the past 100 years. On the other hand, the CDC has data that shows over 3000 people die from receiving blood transfusions JUST in the USA every YEAR.
I'd rather go with obedience to Jehovah and abstain from blood. This stand saved my son's life when he was 3 months old.
2) Vaccines and organ transplants were very dangerous during that time and MANY died from them. Again, more died from getting them than not.
3) abstain means to "abstain"
4) abstaining from blood was given (as you posted) in Noah's day, during the Mosaic Law, and then confirmed to apply to Christians in Acts. The eating of fat was not. It was only forbidden under the Mosaic Law. Christians are not under that.
JW's do not teach that they will "lose salvation" for blood transfusions.
Conclusion: you have no clue as to being obedient to Jehovah God nor do you really understand what or why JW's teach and preach what they do.