Whoops, looks I celebrated too early, though Maestro23's advice put me on the correct path. For some reason the game crashes when I attempt to load it now.
I extracted the datafile.txt from the datafile.big file on the MVP CD using Biggui, and then copied the six lines for "fieldingview" from the old MVP 2005 datafile. I then replaced those lines in the MVP 2007 datafile with the copied MVP 2005 "fieldingview" lines and saved the file.
Next I imported the newly edited datafile into biggui (which was loaded with the MVP 2007 datafile.big file) and replaced the existing datafile with my new one. I then clicked rebuild and closed out the program. At this point I tried to start MVP 2007 and the program crashes trying to load.
If anyone can see where I've made a mistake based on this limited description, I'd appreciate any light you might shed.