If you are going to use wedged washers the angle on the washer needs to be the same as the angle on the camber shims, otherwise you might make an even bigger angle the other way.
I'm not sure how much camber the camber shims actually correct, but I think correcting 1 degree of camber will in most cases be enough. If you correct 1 degree of camber with shims or washers, the difference over a bolt head of 2 cm wide is only 0.35 mm. So your wedged washer should be 0.35 mm thicker on one side than on the other. Personally I don't think it will be an issue just putting the normal bolts back in without any special wedged washers. And I have driven my car like that for probably 50k to 100k miles.