Richard, I just took one of my paddles with me to the local hardware store and found some hardwood dowel stock to fit it. Might have to whittle a little for a snug fit, but that’s my advice.
As far as what you paid, I think the Alfred Andersen Rosette heart was a fair price, but for the one with hinge repair (and non-original handles), I think you over-paid. Damaged/repaired/non-original-parts cast iron is always worth less than that in excellent condition.
Just my thoughts.