I would not cut up Farley sheets just to satisfy the whims of the album makers.
However, collect to way that makes the most sense to you and your level of interest.
If you have sheets, then you have the position pieces, although all-together! I would leave them intact.
If you are determined to "collect the album", the various position pieces have a high survival rate among collectors and are regularly offered on places like
ebay, and often in groupings at a significant discount off the catalog value with some patience. I recently bought a grouping of National Parks NH plate blocks for less than 7% of Scott, although that was atypically low.