Given the nature of the changes that are occurring every few hours let alone every day/ week, I’m not sure the company has yet had time to even look too deeply into how a RIN could work. I’m quite confident it’s not yet very high on their priority list.
Of course pilots being pilots (particularly with lots of idle time in our brains) are turning their minds to such things.
I suspect that’s it for the 747 but I’m pretty sure no final decision has yet been made. Again, what was current a few days ago is no longer current.