Buck: Pretty close to the way I do my cleaning. I usually use a 5 qt ice cream bucket with hot soapy water for the cleaning, followed up with 'Moose Milk', swab dry, blow with compressed air, then swab with Ballistol. Unless I plan on shooting a revolver within several days, I always pull the nipples, clean, blow with compressed air, dab a little bit of anti-seize on the threads, and reassemble. I tried the route several times of just cleaning around the nipples as good as possible even if not planning on shooting the piece for a while. There is just to much of a hard black residue that builds and almost impossible to get at unless the nipples are removed. Feel it is a prime place for corrosion to find a place if not removed. Top strap revolvers and lever rifles are handled pretty much like you described. I don't shoot big bore blk powder rifle, but do shot a 45 caliber cap lock muz-loader and for a good cleaning, remove the barrel and nipple and stick the breech end in the pail and run a swab up and down the bore.
I twice used the ice cream bucker filled with hot soapy water to clean the percussion cylinders by blowing them with compressed air while the cylinder was suspended in the hot soapy water. Was effective, but it was messy. A friend suggested if I try it again to wear a slicker and goggles. I've been outside using a string trimmer and I did pour a cold one of ice tea when I came in and consumed while typing this. Have a good day. CC