I have been teaching this style since my return to the UK.
I do add a whisk in Waltz, and, of course, QS remains as is.
I also teach American style rhythm to my beginners .Eventually, silver standard .
I was asked to demo at a national congress a few years back ( W and FT ) it seemed well received, and I had a few of the usual " I will get back to you ".. never happened.
English teachers, are, for the most part, deeply entrenched in the style in which they were taught to dance and trained to teach. Many say that, WHERE would they include it ,in their day to day business.
There are hundreds, if not thousands ,of Mom and Pop studios and many are very busy with the current format.. Why change a winning system..