To me a pet is something that adds value to my life. If the pet gives me no emotional enjoyment, I do not view it as a pet.
If you want a pet as a way to feel useful to another living thing, I would think helping a neighbor take care of their pet, say an elderly person that has mobility trouble, taking care of that animal giving it walks…that can give you that emotional bond, but also allow you to feel useful, without the financial burden of being its owner, might be your most valuable way to get what you want.
So are you truly interested in keeping insects because that is where your passions may be or do you just want to see live kills in a semi-controlled environment.
Pets are not a convenience but a commitment whether they love you back or not.