2. They could be said for any cable run in a new build. I would say 9 out of 10 builders are VERY aware of cables when it comes to lining walls. If you are really that worried, stick it in some conduit.
3. That's fair, but all that needs to be had is a couple of words to the sparky. "This is fibre, be gentle. Dont drag it over timber corners, and get the bends loose.
I would be way WAY more nervous leaving a simple path way for the Chorus techs. Half of them are too scared to pull an 049 through a 20mm duct, lead alone a fibre through a new build.
OP - I stand by my original statement, put in a hybrid cable and make it as easy as possible for Chorus.