Can we place the WOTS scheme into a Merkle tree structure?
This question is essentially &quot;can we put the HORS scheme on a tree&quot;.  And the answer is yes, as it is the basically HORST.
The question adds confusion by mentioning a Merkle tree and not mentioning an index.  The actual question is (or should've been) &quot;can x HORS public key sets be put on trees with each HORS tree being used to sign each of the x bytes&quot;.
Maybe it is not normal to think of HORS/T as WOTS compressed (or Lamport inflated) on an index/tree, but I will leave the question in case it helps anyone else who does.