Looking for some cat advice

Caveat: I'm following up with my vet for most of this, but she's newer and is having to do a lot of consulting with other vets in the practice.

Info: I have three cats,

• adult female - Nova, 13ish?
• adult male, Pippin 3ish
• male kitten - Fig 5 months (he's very sneaky)

Ok so, my girl Nova has been diagnosed with diabetes. This has entirely upended our feeding schedule and she's not coping well with it. We'd previously used some automatic feeders that dropped food 6 times a day, because she would stress out about not having food and then overeat and would throw up in both scenarios. But now all three cats are on different food (all kibble), and at least Nova would prefer to eat any food but her own, or have seconds, but the others would too if left to it. So they're being fed in different rooms at the same time.

Nova is ravenous, aggressively trying to drag her bowl out of my hands, headbutting the tub of her food (she caught it loose once) across the floor, running to the other bowls in case there's CC. food left once they're separated. She just dove for one as I was trying to just let a cat out of the room instead of pick the bowl up. She's always under my feet in a way that she used to be good about avoiding. I've stepped on her several times, and hurt my ankle and wrist last night catching myself.

Any suggestions for the perpetually (thinks she's) starving cat? I just got her a glucometer and am figuring it out but haven't been taught how to adjust her insulin as of yet.

Part of the difficulty here, and another area I need solutions in, is that she'll (mostly) inadvertently scratch my partner's leg when she wants his attention usually to be fed. I think occasionally it's intentional but he uses a wheelchair and mostly can't feel the leg - a cut can be dangerous for him, but also sometimes the touch/pain sets his leg off in a spasm cycle that is incredibly painful. On a bad day he's feeling guilty for how angry he is at her and is afraid he'll hit her (he probably wouldn't, but he doesn't have the control to say intentionally tumble her like a mama cat to a kitten, and she would probably claw or bite if he tried plus she's been sick and he's already afraid of hurting all the cats with the chair.) he's done the spray bottle thing in the past, she likes water and we know it's not ideal, but it's usually something that happens when he's not looking or can't see or hear her til she gets him.

Finally I need a better storage method for the food. Something she can't headbutt open or into dropping food, but that I can leave out in an open space. Currently I have a bag in a bathroom vanity, a tub of the Rx food in a spare room, and a bag in a closet. They have torn the bags open in the past (working together as a team, I suspect) when they're not secured.
I've thought about the microchip feeders but the youngest isn't chipped yet and frankly they're really expensive.

Summary of Asks:

• Help with a diabetic cat who's perpetually starving
• Help with getting a cat to stop scratching a human's leg who can't see it coming (addressing the first might help)
• Help with ideas for cat food storage/dispensing that would be more accessible than 3 bags in 3 closets in 3 rooms, two of which my partner can't access.

Bit of a vent here too, just everything is expensive right now too so I'm trying the best I can. Pics added.