I genuinely don’t know. What I can say for certain is that the feeling of tension and fatigue I experience in my extensors if I try this is deeply unpleasant and concerning.
It isn’t like the “burn” that comes from exercising a muscle for strength and growth.
Even if I could develop some extensor strength to be able to manage a few more reps at those speeds, I cannot believe it will ever be as comfortable or as easy as the (1 2 3) and (1 2 4) combinations. My extensors will always be required to fight against my strongest flexors and against themselves. That’s a fight they can’t win.