I've been doing something similar. The instant dive kick is easier if you hold the beta bomb for a split second. You can also mix it up further with cross ups (jump forward instant dive kick crosses up but neutral jump instant dive kick does not). Crossing up ends the vortex though because they get pushed out of the corner.Only thing that would make this not work is execution error, possible fuzzy and a good wakeup but u can bait wakeups so id say its pretty much legit.
A very easy to execute but less tight corner mixup is also beta bomb into cross up j2 (mixed up with fake cross ups).