Interesting, but I see many obstacles.
Firstly, just something that immediately stood out as unsubstantiated, there is no evidence that COVID 19 is " reportedly taking a heavy toll among JW’s." Be careful what you write if you want to be taken seriously, especially right now. The virus has likely genetic prejudices, but non faith based.
The biggest issue "Implementing this treatment will likely require cooperation with a blood bank processing convalescent plasma to take the additional step of separating the plasma into the separate products of cryoprecipitate and cryosupernatant..."
As someone that interacts with blood bank often, this is an absurd ask. Requesting blood bank to alter the plasma is wildly unlikely, you mention it, as a casual request, It would need it's own testing/screening process before it could be used as a treatment in COVID 19.
JW's arrive with pre-filled advanced directives with what they will accept and any attempt at the bedside to discuss biology/medicine often goes exactly as you imagine it would.
The patients requiring this treatment are tending to arrive incredibly unwell and require acute intubation, leaving their treatment options to the NOK to decide. The blood/blood product debacle of the JW's is difficult to comprehend and dissect at the best of times, in an emergency, it is unlikely to bend, especially via the NOK who will not want to break the religious confidences of their sick loved one.
I think your motives and efforts are admirable, to ask people to disseminate this to hospitals is ill advised however.
The autonomy of the individual trump's all. They will accept and decline treatments as per their conscience. Hospitals have HLC's that JW's may opt to introduce into their care is they so wish. I would never advocate that they introduce untrained, unqualified religious figures to aid in clinical decision making, Informed autonomy should be patient based and it is for the patient to research and decide ALWAYS, if having capacity.
Me telling a patient what they can and can't have as per doctrine, is no different to WT telling them what they can and can't have. It is a doctrinal game I would never play.
At the end of the day, JW's are not interested in the biology, the medicine, the science. They are only interested in what WT say's is true and acceptable.
I am not WT.
The hospitals are not WT
Write to WT if you want them to discuss this with JW's. Doctors are not ministers and hospitals will never take on the roll of religious advisors. You are asking that we try to convince using WT literature that they can have a product (not yet provided anywhere) even if they think they can't.
Isolated cases may prove fruitful but in the middle of a pandemic, this is not the duty of an already stretched healthcare system.