Do a meaty, deep j.H. He has three realistic options against this oki.
1. He can block. You can mixup or continue pressure here.
2. He can backdash. Your j.H whiffs. His backdash has 8 frames invulnerability, 8 more frames recovery. This gives you time to land and punish with a 2D -> Rensen. Have fun here.
3. He can DP. Your j.H goes through his invulnerable uppercut. If you timed the j.H correctly, meaning you did it very low to the ground by the time he got up, you land and block by the time his Viper goes active. Punish if he has less than 50% tension, expect the mixup otherwise.
(4?). I don't know what happens if he does Tyrant's Rave. Maybe someone can test it.
Easiest way to set up this oki is to achieve knockdown through one of his HS Benten combos. Of course, this is all much easier said than done. But hey, you decided to play Axl.