Problem I have had with putting 10s on size 11 nipples is not firing the first time. It tends to seat the cap on down the first time, although sometimes it fires too. The second hit with the hammer is usually a fire. I got some 10s by mistake one time, and used enough before I realized what the issue was, and wasn't able to take them back
I've got some #10 nipples that I just squeeze #11 nipples down to fit, but they still sometimes fall off. I hear ya on the PITA to keep both around, but sometimes, it is a necessary evil.
If mine ever wear out, I likely will change all to #11. I would think that could be done. Just need to keep the thread size the same and nipple height equal. Don't have to say Remington, etc on it.