FWSY Harvest Bread with Poolish - Sub for Wheat Bran

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First time poster here ...I'm making Ken Forkish's Harvest Bread with Poolish for the first time. It contains 10% WW, 5% wheat germ and 2% wheat bran. It also suggests coating the loaf in wheat bran for crunch. I have wheat germ but not wheat bran.

Should I just substitute the wheat germ for wheat bran or could I use something like flax seeds or ground up rolled oats? 

Also for the top, any suggestions for a nice crunchy topping without wheat bran? In my pantry I have flax seeds, wheat bran, rolled oats, sesame seeds, poppy seeds and caraway

Thanks Ted!

I left out the bran from the dough, but picked some up before baking so I added it to the crust. 

A few mistakes along the way but it has a nice texture and flavor anyway. It's quite flat and there could be a few reasons. I forgot to do the folds. It also got a bit stuck in the bannaton and lost a bit of its shape. I'm sure it doesn't help that my dutch oven is really big so it doesn't force the dough up. Coincidentally I just picked up Bittman bread from the library and since i always have issues with ky bannaton, I'm going to try his no-bannaton method

My first whole wheat loaf and I'm excited to try again. 

Going into the oven:

Finished baking

Crumb