If you are looking for a lightwieght grapple check out the Single lid Wicked grapple(274lbs). Everything Attachments Compact Wicked Root Grapple 50" If you want a grapple with a larger opening or one that is heavier duty check this one out. Single Lid Root GrappleIf you want a 2 lid grapple check this one out.Everything Attachments Wicked Root Grapple for Compact Tractors If you buy a dedicated grapple and forks you will have about the same money as what you will in an artillian that you have to assemble when you need it.
If you want a set of pallet forks here are a couple.
42" Pallet Fork Attachment with 2" Trailer Receiver Hitch for John Deere Loader | eBay
These are cheap but they don't have a back rest.
Titan 42" John Deere Pallet Fork Attachment 200 300 400 500 Loaders | eBay
These have a back rest but I would add some expanded metal to the back to protect the tractor more.
Even though the Emerald Ash borer killed those trees they will still make some good firewood.