I do this very often too, as well as oil masks with a bit of honey since those ingredients are also deeply moisturising.
I'd just be cautious of using lemon since the acidity can cause your hair to dry out, or in this case, make the mixture less moisturising. It can also cause your hair to naturally lighten if you go out in the sun, and it's not as harsh as bleach! Great post :)
Thank you very post and I am grateful to you for sharing your wisdom with us