I forgot the tip about using non-lacquered coper wire........that rules out electrical windings like dynamo's etc where the wire is lacquered. 13 am non-braided would be fine.
Copper wire is good as it has no "memory" and stays put when you wrap it.
One way is to start the wire flat against the spokes at the join and wrap the wire over it to cover the first loose end if possible try and tuck the last loose end under the gap where the spokes cross...............if that makes sense.
Set aside quite a bit of time as I found it took ages...I used to tie all the spokes and then solder. Other people tied and then soldered as they went, lobbing water at the solder to prevent burning fingers......to much water flying about for me.
I was glad when it went out of fashion apart from Track wheels