the spokes on my gn400 were the bane of my existance.
that machine was hard on those rear spokes. ( well maybe i had something to do with it also.)i went through three rears sets. so i've waited to chime in on this one.
during the time the oil drains check the tightness of all the fastners on machine. includin the spokes,with the wheel of ground spin i gently and use a 10 mm wrentch to let the spokes drag by. you should hear a constant tone around the wheel. loose ones will appear off note.
tighten those you found loose repeat spin.
sunny
there are several options availble dependend on time, money, skill. some have been mentioned and could work to your satisfaction.
the best and by far the most time consuming is to delace the wheel, prepare and paint spokes, relace wheel. like i said it is time consuming and takes a degree of skill. i tried it once and ended up sending it out, it cost me about 80 bucks then. but doing it that why would bring you the best results.
maybe you could go with a powder coat at that point.
of course it's sooooo easy to spend other peoples money.
but with the help of all the people here it should be a job you could undertake succesfully.
keep us posted.
sluggo