"The real indication is not the change of body configuration (to actually do what you describe would substantially overdo what is appropriate), but simply finding herself already moving in a direction that can only be promenade."
I'm sorry to play English teacher but I'm going to restructure your sentence to make it more clear.
"The real indication is . . . simply finding herself already moving . . . ."
I can't tell if you're using the word "indication" to mean the man's technique of leading or the appearance of the figure to an observer or something else altogether. If it's the man's technique then the statement doesn't make sense.
Exactly how does she "find herself moving" in any direction? Answer: she doesn't "find herself" doing anything. She follows the mans lead.
One problem in the Open Telemark that has not been mentioned in this exchange is that of early foot rise, especially by the lady. I know from experience that it can cause the man to open improperly. Again, a good lead into the heel turn resolves the issue.
Moving into Promenade Position to begin the third step does not "overdo what is appropriate" if the man maintains a strong right side through the turn of the second step. Otherwise, he will be tempted to use his arms to establish PP. I think that you're imagining a much more open PP than we execute.
These are matters on which I have spent many hours working with my partner. We tried a number of the gimmicks that have been mentioned. The problem with trying to turn the right shoulder to the chin is that the lady will look down at her shoulder.
I have been told by practically every teacher that I've had that 95% of the problems in any figure are caused by the lead. When I take responsibility for leading correctly, those issues are resolved.
I'm sorry if I seem to be bull-headed on this topic but there's a tendency to make issues - and their solutions - seem more complicated than they really are.
Cheers.
jj