The point is I guess is to not sending back your bodies to your retailer but directly contact Fuji.
The more bodies they got in their repair services will move them!
I got the same answers as you from Fuji France, they never heard of this issue before, my X-PRO 2 is the only one camera sent back to their repair services, lucky me they succeed to replicate the issue, even with the latest firmware, and finally see that's an hardware issue.
I totally understand you since we are a lot out there around the world with this issue, but not enough to be heard nor considered.
That being said, I try to be in their shoes, I'm talking for the France department.
Being the only one case in France I find that they doing well even if it could take time.
My Fuji Rep does a very good job for an only one case they heard of by first considering this issue as one then proposing me a loan camera during the whole process of my repair or replacement.
Mine will be certainly replaced as he said.
As a new launch camera, it's obvious that's for Fuji Japan the detached pieces, at this time, are dedicated to making new cameras than repairing them.
I can understand them, I only hope that this experiences will serve all Fuji around the world to improve their support service.
At this time, following your serials numbers, this issue appeared on 61M05XXX and 61M06XXX series