To apply an unnecessary adjustable wrench by making a useful tool out of it is a great idea. Alteration is quite simple, while the key can always be returned to its original state in order to use its original version.
For crafts, you need a pair of small bearings and a cutting element from a standard pipe cutter. In fact, a homemade product reproduces a pipe cutter using the capabilities of an adjustable wrench.
Bearings become rollers, they are mounted on one sponge, and the blade on a second. Additional elements are fastened in drilled holes to ordinary bolts.