My goats get free access to some large patches of RWH, but will eat some, wander round eating other stuff then back to WH. Never had a problem with bloat. Looking round neighbouring fields (sheep), i can't see WH anywhere, but plenty on the lane sides.
Himalayas Balsam is a problem round here as well, the frustrating thing is, the advice says don't pull it once it starts to set seed. RUBBUSH! Why let the other 99% of seed develop?
I leave it as long as I can so the bees can have some, then cut it down, don't pull, esp on soft slopes, that only destabilizes the soil. I've reduced the area to manageable amounts, but neighbouring land (sheep) is full of it.