You're better off to let Joe do it. Lots of reasons...
I also swap out the 3R sets for NWSL. Like Ron said, swap out the lead trucks and do some paint work on the drivers. You may find it adequate, I did for 3R. Makes a huge difference. What track are you running? How well is your track laid? If it's not perfect, scale wheel flanges will find it on every pass...Matt posted a youtube video of an MTH Big Boy with scale wheels (flanges and all) on 3R tracks. You may want to take a look.
If your running 100" RADIUS, wheel interference won't be a factor. I've ran on 70" radius with BBs and no problem.
Seems like a lot of effort but I understand your situation.