Upload & Sell: Off
Another issue is in DX you can turn the zoom ring to 55mm and generally not have too much of an issue, doing that on a 70mm on FX typically gets the nose out of focus, so definitely a case of changing my shooting style.
Yes, there will be a bit of a learning curve with the differences in DOF, but put in the time and see if you can adjust. If not, DX will still be around for the foreseeable future, and it shouldn't be hard to trade your way back if DX better meets your needs.
I had a similar but opposite issue. I shot 35mm film for 19 years prior to moving to digital in 2006. I was so familiar with the 35mm format, that I could compose my shot and have a mental picture of how the DOF and final image would look, and this important with no LCD to chimp with. When I got my first DSLR, a 1.6x crop Canon, I struggled to get my chosen settings to "look" like i felt they should look. I always carried a film body for backup and would shoot the most important shots(the ones I needed to nail) on film, because I could still predict its output better, even with the ability to chimp on the DSLR. About 2.5 years into my DSLR experience, the D700 was released, and I jumped for one. From day one with the FX format, I could fire the shutter and get the DOF and look that I was attempting to shoot. For me, the transition to digital was complete. Sadly I haven't shot more than 2-3 rolls of film in last 4 years, but I haven't needed it.
I don't believe there is much of an image quality capabilities between FX and higher end DX bodies. Shoot whatever feels best and fits your shooting style better.