the Captain can't be premature with the checklist as things happen when he wants them too
I disagee with you here.
Here is a quote direct from the Airbus Flight Crew Training Manual :
The Pilot Flying (PF)requests the CHECKLIST, and the Pilot Non Flying (PNF) reads it.
This mentions nothing about the Captain reading it when he wants, they way you think it is. It says :
"THE PF REQUESTS..." (no mention of Capt here)
and not (as you believe) :
- "the Captain will offer..."
or "the Captain will always inititiate the checklist whether he be PF or PNF..."
or "the Captain (when PNF) will offer the checklist to the FO (who is PF) when the Captain wants..."