I can't see why you would do this. I'm an RHCE also (actually, mine's expired, I did it so long ao). My first linux install came on two stiffies somewhere in the mid-late 90's and I ran linux desktops continuously both at home and at work, until around 2007 when my HP laptop's mobo died for the 3rd time, and the 2nd hand Mac Mini I picked up a year earlier to play with became my makeshift desktop. I was impressed enough to pick up a white plastic MacBook and started using that as my main machine. At work, I kept the linux desktop until around 2012 at which point I switched to Windows for "enterprise software" reasons. After three years of Dell Hell I finally switched to a MacBook Pro with OSX late last year. Keep in mind, until a few months ago, I was a mostly Linux and a little of other *nix sys-admin at a hosting company. I spent most of my day fixing stuff customers broke (who ever thought it's a good idea to give customers root access??), testing new releases, automating stuff, etc.
So, with the peleasantries out of the way, here are my thoughts:
1. There's very little you learned in RHCE that is relevant on a desktop.
2. There are very few skills you acquire (or keep fresh) using a linux desktop that has practical application where you encounter Linux in a money-making capacity (web/db servers, mostly).
3. Most of what you can do on a linux desktop that has relevance in actual linux work, you can do on OSX too. In fact, having to cope with a slightly different environment where every thing isn't where you expected and you have to add dependencies and replace bsd variants of shell tools with gnu ones (hint: install brew) will probably do more to sharpen your skills than running fedora ever would.
4. Unless you're aiming to work for the next start-up that will go bust trying to usher in the year of linux on the desktop, most of the work linux people do can be done with no impact to efficiency from Linux, Windows and OS X. Get iTerm2 on OSX or SecureCRT on windows, and you have everything you could ask for in a terminal client.
YMMV
