Sounds delicious. This, as a policy, seems to be a stronger strategy for Rachel as she really has a hard time "beating" rush-down. You need to be a strong blocker as Rachel to take on faster opponents, and insta-blocking is apart of that.
One idea for anti-rush is a bit risky: shooting out an A or B-lobelia semi-randomly, though if i have full wind, I'll do it and then redirect the shot if I see them move. Jump back, C-lobelia is also a good idea against characters that are weaker in the air.
Versus Hakumen, I feel you need to keep in mind he never has 100% zoning, even though his c-slashes are very wide. They're also slow, though, so just be very conservative with what moves you do, especially with your back to the wall. You've got to always be ready to block, especially against a Hakumen who knows to not try to take you in the air. Wait for your opportunities to show, and keep things interesting with pumpkin and frog.