Ravenscroft is well post-mediæval, you might as well say Beyoncé is Regency.

The idea of indicating triplets by beaming goes well past Vickers - Rachmaninov did it sometimes. The problem with the notation of triple-time hornpipes is that a lot of the people writing them in manuscripts didn't really know what they were doing. Many 18th century notebooks have 4 bars of 3/2 written as 6 bars of 4/4.