Chuckychuck and I were testing out options for Killer Frosts blocked slide when I mentioned "what if you could grab her out of it?"
Well, we gave it a shot and it actually worked; after about 10 minutes of practice he was able to throw me quite consistently. I was also not sliding on cue, we were weaving in and out of various ranges and everything was done randomly & on reaction. He was also able to throw a "wake up attack" slide as well; the character spacing was just outside of neutral (start of match).
We tested it out with most of the cast and it seems to works across the board. It's easier to execute with certain characters that have better throw hitboxes (eg: Black Adam, Aquaman, Doomsday) and if done correctly, will always have priority.
The viability depends on the user and the main focus here was to showcase the tech. Perhaps someone will discover additional tech by watching this video and how the hitboxes interact.