Thanks everyone! Good points and suggestions. I’ll try and reattach the line. I do not really have anything to lose. If it does not work out I think the idea of using longer leaders makes good sense.
So Bob, I think I follow everything you suggest up until the nail knots. I’m trying to figure out 1) what to use to nail knot over the spliced area and 2) how to use two nail knots to “secure the line”. Perhaps some backing or mono? And should the two nail knots somehow be structurally attached to one another (e.g. their tag ends threaded through each other)?