No, melting coper wire and dripping into molten lead wont work. The molten lead is way too cold and will actually cool and solidify the copper.
Ive been gone from this post for about a year, but I did mannage to alloy coper wire into lead inguts by TIG welding and slowly pooling small amounts into the lead thwn remelting into a large alloy batch and repeating till youve added the desired ammount.
The arc from the TIG welder efectivly gets the lead at a small area under the arc hot enough to mix effectivly with the melted Cu wire. If you get greedy and try to add too much Cu to a single spot, it doesnt mix in and later floats out when its all melted. Also you can only add so much before the whole ingot overheats and melts, so I did it in cupcake tins.
Takes some practice to get it it down, but it is a workable option.