Just cut down a road bike spoke to fit any bicycle kids or adult...cut the opposite end from the threads off and bend it downwards at right angles...o.k your making two bends one 90 degrees and the other bend 90 degrees downward...just hook it in were it is suppose to be it will never come out.
The only trick here is measuring correctly
It does take practise...but you can get good at it...I've done this occassionally
for a quick fix.
I tested these spoke out under high tension for 6 months they held up very good?...Eh there isn't nothing that us bicycle mechanics can't do?