@MaryIsobel
I don’t think this is what you are looking for, I wanted a bread suitable for sandwiches, but do take a look at The View from Grand island , you will find the recipe there. I used 1 c.AP, 1/2 c einkorn, 1 /2 c ground oatmeal, this was for a very small loaf.
i do think you might want to take a look at Ballymaloe Yeasted Brown bread which is the more typical style of brown bread. David Lebovitz has a very good recipe and description of the bread and his stay at Ballymaloe.
i also use Odlums coarse wheat flour when I’m making a more hearty soda bread, this is extremely coarse.
I’ve also used wheat bran and wheat germ in Irish soda bread.
The NYT has a recipe by Darina Allan which uses 50g Odlums to 400g AP which makes a lovely soda bread.