Based on what you, Admiral told me, I believe there should be no more limitations on who you can play on defensive line on punts or on defense. Go ahead with your 200 pound CB rushers. If this becomes a problem later on, folks let me know.
It should only be an issue if you have a non punter doing the punting or if your Punter has less than 75 for punt timing.
Rare to see more than a couple per season and always due to the above two issues. A 75 speed LB can get to a Punter with low timing if he can beat the block.