Well… So I found them. This is what sets 1394 through 1399 were going to be at some point.
We can presume these were canned before 1388 - 1393 were finished, as they still have the Turaga tools which, as said, were only able to be held in an earlier iteration of the mold. Thus, the versions of 1388 - 1393 that these would have been available alongside were probably different (note the lack of, for instance, sand purple). With the exception 1397, these all use light grey heads.