well, the number of times you would have to press the lever down would be reduced for a given number of rounds, but the amount of pressure you have to apply seems like it would go up, since each press of the lever is doing more stuff, unless the handles are longer......
Is it the actual action of doing it thats causing trouble, or the ammount of pressure you have to apply? If its the latter, you could fabricate some kind of extension to the handle, a longer handle would mean it would take less force, you would just have to move your arm through a bigger stroke....
Or, just start reloading left handed.....