Sydneybrit, hard one. I think I would try substituting some bread flour with Semolina.
Use 400g Laucke wholemeal flour
100 g semolina
2 teaspoons of dried yeast
320 warm water, (300 would normally be enough with white flour but wholemeal needs a bit more)
Follow the process for Cookies Vienna loaf ormy No Fuss bread/ rolls.
Let us know how you go .