Everything is possible.
My view on the evolution are as the following.
1. I don't know about weng Chun because that is a different art comparing to wing Chun.
2.Horse rider who is in this forum who is the descended of Leung jan lineage has provided the information of the long set break into three sets in last year post.
3.According to ancient chinese martial art , a complete art has two parts the 體用 or body and application. San Sik is belong to the application part. While set consist of both the body and the application part. So, one cannot make a complete art from just the application part or San
The snake engine is a core of the body of the art.