"Now on Friday the elder I wrote to together with another one, will talk to me about that subject."
Two witnesses is what they need for a JC. Your not going to present any kind of information about the blood issue they would accept. So why empower them. Do not meet with them.
I'd call off the visit....... tell them your still doing research and rethinking your point of view........ then just stop being involved with JW's. Walk away.
Remember this is a group that has developed an ignorant culture that allows them to compel their followers to avoid medical procedures that they don't approve of. First it was vaccines....then they changed their minds. Then it was Blood. Then for a decade or so they were against transplants...... then they changed their minds. Then they changed their minds about blood and allowed factions. Of course factions don't get the job done in many situations so JW'S continued to die.
Eventually, some feel the WT will step away from blood banning entirely.
But the long of it is that many thousands including children died needlessly because of the ignorance of the WTBTS positions.
With that kind of unloving attitude why empower them........ just avoid them all together including meetings.