Just get in the lava, position yourself under the hole, hold A, and just as the morph ball is about to break through the lava-surface, start laying bombs with regular bomb jump timing. Double bomb-jump timing works too, and is optimally better, but for safety I'm just gonna do singles there, lol.
I had the same thought of going through the bottom of kraid with this route, thanks for testing it kirby. It looks fun for sure.
Also, I lold when you froze the ripper
Also, I lold when you froze the ripper