could I assume that the Watchtower itself has not published its views in any of its publications ;of donating blood ;under restricted conditions being a conscience matter?
To my knowledge the WTS has not written anything of the sort that the rank and file JW would have access to. Even the dumbest JW would realize the stupidity of the doctrinal claim they make that JW's abstain "FROM" blood. How do you abstain FROM something whilst using FROM the same substance at the same time.
I doubt if even many CO's have given it much thought. The one I had a run in with certainly didnt. They (the elder and co) were more interested in if "I believed that the faithful slave was God's representative on earth" than answering any questions I had at the time about blood.