I wouldn't want to try and lift someone up without a winch. Its hard enough for us old bucks to do it with a winch! I guess if you can't get the topping lift to the winch you could use the spinnaker halyard for the bulk of the way up until it wouldn't go any further with the topping lift as the safety line, then shift to the topping lift for the last few feet and the spinnaker halyard as the safety line You would need a minimum of three people at the deck level. Two to operate the winch and tail the line for the initial hoist and one at the mast to take the slack up on the topping lift. Just make sure that guy on the topping lift has it secured around something so that if it has to be used to catch a falling body, it will actually do so. I assure you that just holding onto it while you take up the slack is a recipe for disaster. When the fall occurs, if it does, no one can hold onto a line without some turns on something to stop a falling person. Think the "three stooges" scenes and you'll visualize it. A hard part will be making the transition from hoisting with the spinnaker halyard to the topping lift. If this is your first time aloft and you have to jury rig something, (and it sounds like it is), DON'T DO IT!!! Hire a professional rigger. He has the equipment and experience to do it safely and the cost of the hospital bills for you, if you are fortunate enough to make it to the hospital, are far less than the riggers bill.