I know this map isn't even in the campaign, but I think this might be also worth a try but, in this map there's a bubble that will lead you to a platform with Hyper Bomb, the issue here is, there aren't bubbles in the 3rd or 4th castle of MM1, well there's that Bubble Boss in the 3rd castle, but this doesn't count, I think...
(http://i.imgur.com/xbad14Z.png)
This could be replaced by Guts' Blocks or maybe even better, you could remove the bubbles, there's that MM4 grapple/hook thing in this stage, theorically, the only use of this hook in this stage is to get the tank close to the ceiling, but if you remove the bubble the grapple could be more useful here, and it would also make Hyper Bomb "harder" to get.