Some of these are in your blogpost. I'm going to use the Forth terms.

• NIP: ( x1 x2 -- x2 ).
• OVER: ( x1 x2 -- x1 x2 x1 ).
• TUCK: ( x1 x2 -- x2 x1 x2 ).
• 2DUP: ( x1 x2 -- x1 x2 x1 x2). Particularly useful for paired archer's, architect raycasts.
• PICK: signature complicated. Basically imagine fisherman's gambit but it copies the iota.

somewhat sketchier and less general but still useful:

• 2OVER: ( x1 x2 x3 x4 -- x1 x2 x3 x4 x1 x2 ).
• 2SWAP: ( x1 x2 x3 x4 -- x3 x4 x1 x2 ). Swindler's is probably easier to do this.

Related is the idea of permitting negative offsets for Fisherman's Gambit, with the idea that those stuff the datum deep into the stack.

Wait, I don't need to implement nip, we have bookkeeper's