Surely common sense dictates that you aren't going to carry out steep turns when you are too low, close to cloud, in controlled airspace or near airfields - and a good lookout both before and during the manoeuvre is a must.
So, without trying you've completed H*LL of the HELL check. Regularly monitoring the engine(s) is also good airmanship.
Therefore you don't need a book and an argument to fly safely when practising steep turns
Combine a level steep turn with some other training exercise or variation on the theme (as mentioned above) and then it would certainly be good practice, and common sense, to add in the additional items from the HASELL checks.
Mountains and molehills.