Most the tires nowadays should be pretty good...
If bobbley, and not an indexed tire, let out the air and rotate it 180% on the rim and try again.
I have heard of using BB's as Karl described... More than a few times. It must work.
Common lead (Pb) solder, a short length wrapped around a spoke at the nipple and perhaps taped over with electrical tape should work.
Many riders did it for years...
Me? I would go for it and pick a speed where there was a less noticeable problem, but carry a short length of the solder.
redk