I am really not sure exactly what I have here
Maybe the misunderstanding is because you have described your bike as a K3, which requires the extra black paint for the interior of the decal. Look at the difference in the decals in the link that retro rocket has provided.
So... you have already purchased the extra black paint but not the decals?
I did a repaint on my K1 a couple of years ago and it was money well spent. Vintage Honda paint, Reproduction decals, reproduction sidecovers from David Silvers/LPM. Afterwards, the painter said he might rather paint the stripes on, instead of using the decals, for a better finish. I have NO complaints with the finished product, although it took a couple of tries to get the correct decal.