That is correct the shade fits over the filter(s) of course you loose some shade effect as the glass pushes out but one filter is never going to be a problem. I'm sure you will enjoy they are wonderful tools.
You will need to push to 40mm glass before the B60 is too small and up to 350mm at the other end. the 60 is "universal". Shades the same only difference is the length. So a 50mm lens shade 40668 will it on a 150mm lens, it just won't be very effective.