Music wire is probably not the best choice for hammer forming. I just guessed at how much to heat it. Without knowing any better, hammering it could be playing Russian Roulette. A Gun Smith would probably know.
MW takes silver solder really well, so joining metal ball sockets to it ought to be pretty simple.
I set my stab halves in a solid balsa V-Block and then join the V-Block to the fuselage after it has been all framed up. I learned that from assembling a Lanier ARF.
Now that I see how the linkage is done, I've got a couple of .40 sized "Quickees" that need to be finished.