Easy Lift Off will take off the lettering but you may remove some paint. Easy Lift Off works pretty fast so you want to go slow and not use a lot of it or you'll wind up taking off a lot of paint.
You might also try 90% isopropyl alcohol. The alcohol works a little slower. Make sure you get the 90% or higher not the 78% as it doesn't work nearly as well.
Neither of those will damage the plastic.
With either approach you'll just need to apply the solvent to a Q tip and rub slowly on the lettering.
