I've been trying for about a month now.
There is always some saliva between cheeks and teeth and getting it on tongue without using buccinator almost seems impossible.
Also i found an image for tongue sweep. It seems exaggerated but is it correct?
Even little bit?
Here's one of Dr. Mew's tongue sweep/micro swallow videos:
https://www.youtube.com/watch?v=8d5awyc_ZQ8&t=3s
A contributor called @starjammer also described a variation called the giddy up method: