Safe jump dive kick can be mixed with x-up tatsu or empty jump low. There is still mix up from this setup to open him up and keep the vortex going. It’s not a castrated vortex, each character requires specific setups to get the most out of your pressure, DeeJay is no different. I don’t even understand why DeeJay is even an issue for the vortex as you can take more chances against him because he can’t parlay his upkicks into 400 damage like Ryu, Viper, Sagat, Cammy, etc, yet why is nobody complaining about vortexing those characters?
DeeJay is not difficult to vortex, you simply must be satisfied with the options that work best. Besides vortexing DeeJay shouldn’t be the goal in this match. Akuma can zone him out for extended periods.