No you would be better off using concreaq (ceament).You could use it for a mold .

Brand name is probably "Water Putty"...yellowish beige powder you mix with water. Got mine at Home Depot. Hardens pretty quickly, but may be cost prohibitive for making an entire paver. Pave Stone is one of the largest mfgr of the keystone shaped pavers. Is there perhaps a big box type home center or a landscape/nursey supply close to you?

HTH,
Pat

We have Lowe's and HD. They don't carry these.