Matt, I developed some C41 and b&w 120 film last weekend, and wasn't well able to do as I suggested above. I don't know what functionality your arm has, but I WAS able to load it using one hand and my other hand closed to a fist.
Using a changing bag, and holding the film in my right hand I rested the reel on the table surface. I used my closed fist to hold the reel in place and was able to also press down on the spring to allow the film leader into its lock. After that it was easy to 'roll' the reel to catch the film and spool it up. Tearing the film off the backing paper was a different story, however. Maybe scissors would do well here, which would also avoid the potential of static charge releases.
Anyway, I think with some practice it's doable, but it seems one needs a second arm to do it as far as I can tell, even if there is no fully functioning hand present.
How do you load your reels for processing now, Matt?