Hello again jane,
Only experimenting will give you the best answer.
Here are two old posts, one about cones and one about half and half honey and conditioner. Both seem to be in favour of giving what you have at home a try.
Do not forget to microwave the honey. I forgot to do that the second time and I lightened my henna. Honey may/will lighten natural hair as well.
Good luck.
I put in bold part.
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