On subbing sweeteners: You should be able to use regular sugar or coconut sugar instead of brown sugar in the recipe. I have not tried honey so I'm not sure if it works, but if you do, I would stick to 1/2 of a cup.
On substituting flours: If you would like this bread to be gluten free, I recommend an all-purpose gluten free flour, such as King Arthur's or Bob's Red Mill. Do not try to substitute coconut or almond flours.
Feel free to use orange juice and zest instead of the lemon for a unique twist on this recipe. You could also try fresh cranberries instead of blueberries!
You can use coconut oil instead of olive oil in this recipe. If you do use coconut oil, I highly recommend adding in a 1/2 cup unsweetened coconut flakes!
Recipe adapted from Isa Does It.