They should use the Richard Kiel body and just put a one-piece furry suit plus headpiece over it - kind of like a tribute to the original creation. Then they wouldn't have to create a special figure. My main concern would then be the fur falling out, like it did with the original Hasbro Bantha.
The exclusive could be a Peter Mayhew head to go under the headpiece!
Should SSC go that route I think a Peter Mayhew head should be standard. Given the nature of the figure I think SSC would be advised to get Hot Toys to lend them a hand as they are second to none when it comes to engineering complex pieces.