A cheap pickguard maybe but decent ones are double the cost of a can of nitro. It also depends on the effect your trying to achieve, changing colour is one thing, if you want it to look aged, then amber nitro looks great. But you are right, you need to wait for better weather.Amber nitro will cost as much as a new pickguard, and sun will take months, in summer. I don’t think coffee will really stain acrylic, but then there is no risk trying. Keep us posted.