I've ground up pale galaxy malt as a 10% bread addition. I did not have me dough proofing box built yet and it was a slow rise and the additional sugars made the crust brown and burn quicker so you need to lower the oven temperature and bake longer. Vent the moisture if you can.
Taste is interesting for variety in your bread diet. Not revolutionary but good for a change. If too strong lower the ratio of malted barley flour.
Cheers,
Brewer Pete