Post game interview here: Out of every camo grind I have completed none have ever left me so filled with pride and accomplishment at the end of it. I really came around to liking MW19's multiplayer through this grind and it has made me a far better player on so many levels by forcing me to unlock it without hardcore, small map playlists or any other "fast lanes" that camo grinds usually revolve around. Going forward I might genuinely grind all my camos like this as it gave me so much more enjoyment and made me actually interact with the core game and it's maps for nearly the entirety of the grind, which only made the occassional shipment or shoot house match that much more special and huge for whatever gun I was doing at the time.
And at the same time, playing the base map rotation instead of shipment 24/7 makes it so I can actually continue to play well on those maps since I've learnt them and their flow throughout the grind. I vouch for this since I also completed MWII's mastery camo Orion almost 100% on Shipment and when I started just playing the base game, I was TERRIBLE despite having the mastery camo since I hadn't really learned anything about actually playing MWII.
To any other camo grinders, I HIGHLY recommend this way of doing a camo grind.