I've seen many questions migrated from ELU to ELL, but I don't recall ever seeing a question go the opposite way. I also admit I don't know if my question here should more properly be asked on ELL meta (maybe it should even be posted on both, but that seems a bit OTT).
The ELL question that bothers me is Is the construction “whose each” correct?. It was asked over 2 years ago, but the OP hasn't returned to ELL since posing the question. I've probably confused the issue even more by offering a bounty a few days ago, but we are where we are.
My current thinking is that from the learner's point of view, the cited usage should probably be considered "non-standard, unusual, dated, undesirable", but that the specific matter of whether it's grammatically acceptable today is largely irrelevant to the needs of learners.
My specific question here is really a two-parter:
1: Should that particular question be migrated?
2: If not, under what if any circumstances might ELL => ELU migration be recommended?