The complexity is not in the icon, in fact the shopping cart icon is visually complex, but it's already adapted to the user's eye. The tricky thing about this case is that actions are being added to the shopping cart, so the icon to get is the action, not the cart.
I would personally separate the content from the action, emphasizing the action in each icon. For example and always referring to the shopping cart: add, delete, add item and remove item. Source: {removed}
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