In a similar vein, swap out the grinder for a shredder/wood chipper-type model. You will no longer have to cut the apples open, and you can fill it by the bucket rather than one-by-one. Much higher throughput.
To clarify, with the grinder I built described in the post, I did not have to cut open apples by hand any longer. It could shred apples as quickly as apples could be put on the ramp.