woo hoo, moar new Gintama! Looks like one of the newest arcs! =D
My opinion is the same as ttx- redraw after denoising because this way, what you see is what you get...denoising can be too unpredictable.
There are other ways of blending cloned art... one of them is to overlay some filter on at 20% after everything is done. It could be a screen of light, monochromatic noise, even blur.