Strictly my opinion, I am just saying...
2 monitors trumps one large monitor every time, even if the monitors do not have the same color rendition. (I currently have 2-24" monitors)
1. process on the better monitor
2. the 2nd monitor is not bad either, as one gets to see what others without calibrated monitors are seeing when viewing their images.
3. The second monitor can be used for so many of the process parts and opening other programs, or it can be off, not effecting the processing if it bothers you.
Mine is off now as I am surfing. There are times I have about 20 windows open between the 2 monitors, as I have learned how to use the setup to the best of my ability.
4. If you need additional desk space, get a file cabinet with wheels and place it under the desk, wheeling it out when necessary. I did this about 10 years ago (before I got into photography), and it rarely gets wheeled under my desk space anymore.