Try_hard
I don’t know if you thought of it and I know Diane Smith is erased in infinity, but it doesn’t seem to include time and if she wasn’t erased from time, that means the main character could go back in time and either take her from the past or get her DNA to clone her either way she could be added to the harem having Diane Beth and Summer maybe even get a version for Rick the reason I don’t think she was erased from time is because if she was, Beth would not be able to exist when someone is erased from time everything they’ve done or achieved is erased as well and since Beth is Diane’s daughter, Beth would’ve had to been erased as well so I think this is completely feasible