I have instructions on how to do this on my web site. Several people have done it and found it to work for their needs. However, we have all experienced some "hernias" of the Amsteel through the cover of the double braid in the splice. It seems to be just cosmetic. I don't personally use this but rather found the hernias in testing which put about 1000 pounds on 1/8 Amsteel to 1/4 inch StaSet. You are unlikely to see this kind of load on a topping lift.
The "official" way to do this is to have interlocking eye splices but you would have a fairly large increase in line diameter at the area of the splice.
http://L-36.com/halyard_splice.php