1. Revolvers, by their design (both those with movable and immovable cylinders), invite cleaning methods from the muzzle. I do understand you are 'touchy' about the muzzle crown.
2. Most of the cleaning kits by Hoppe's, or Winchester, and I think I have seen one by Birchwood Casey, have rods made of materials that will not harm the muzzle. There is an Otis cleaning kit, that uses a 'floppy string', that you can move from the breech towards the muzzle. There is a 'boresnake rope' with a cleaning brush inside of it, that is inserted from the breech. You have many choices, and they all do the same thing .. clean your revolver.
3. Most pistols that I have laid eyes upon, are able to be field-stripped, or quick-stripped, (magazine removed first), down to the spring, frame, slide, and barrel, via the removal of the magazine release lever. Pistol barrels, I have cleaned in both directions, at one cleaning, after one set of patches came clean. Same rods, or ropes, or strings.
Lastly, the chief desired result, is to have cleaning patches run through the barrel (revolver and pistol), and the cylinders (revolvers), as clean as can be seen with no residue evident.
A note on revolvers: If you are shooting a revolver that accepts a "magnum" cartridge and its shorter "special" brother cartridge, and you shoot the "special" on the range, and leave the "magnum", for more business matters, clean the cylinders BEFORE you switch to the "magnum" cartridges.
There is a slight bit of 'gunk' left in the cylinder, where the cartridge lip ends, and the bullet leaves the cartridge while in the cylinder, before it goes down the barrel to your aiming point downrange. "Special" cartridges are SHORTER than the "magnum" cartridges. That "gunk" could build up just enough to create a smaller cylinder width, and you might feel a little shove to seat the "magnum" cartridge properly. That layer of "gunk" JUST MIGHT be thick enough to STOP the forward travel of the bullet. The trapped gases of powder ignition have to go "somewhere"! Not good for you physically, not good for your revolver cylinder, not for making a good day all around!!