I don't know much about high speed flows, but I imagine the answer is no. While the gas temperatures would be higher due to viscous heating, which would increa

I don't know much about high speed flows, but I imagine the answer is no. While the gas temperatures would be higher due to viscous heating, which would increase the viscosity of the air, the increase in viscosity is much lower than the increase in velocity. So the Reynolds number would still increase. I very strongly doubt the turbulence intensity would be lower in this case too. Plus, I imagine the bristles would be quickly ablated away.