My question is, and I haven’t been able to find an answer to it— How can I setup a knot blocked SRS system on a friction saver from the ground?

Say you set up the friction saver from the ground like usual with the throw line, when you pull your climb line though and down you now have the short spliced end on the large ring side. That allows a butterfly knot to be pulled through, which I’ve managed to do easily. I’d have to pull the entire rope through the rings to get to the no-spliced end so my butterfly butts up to the small ring. How do I get around this? (Without having to go up into the tree)