I don’t know if this might help. I don’t know anything about techniques so when I read your question I went on Youtube to hear what you were talking about and I think this is pretty similar to something I’ve been doing for a while. I’m really no expert.
I uploaded 2 videos in the community riffs couple days ago, one where I show a little trick where you can just improvise with all of your strumming hand’s fingers and the other where I put it into practice (it’s pretty much a better example than the first one but there’s only audio). From what I heard on youtube it sounds like the technique you’re trying to learn but I might be wrong, I didn’t even know it was a technique but I’ll leave it here anyway:
Riff #1
Riff #2