The best the QRH gives is
Warning! Inform ground personnel NOT to open any cargo door after landing until all passengers and crew have exited the aircraft and fire fighting equipment is nearby
That information would already have been passed to ground staff prior to landing most likely, and probably reiterated after landing.
Which option carries the least risk of injury to the passengers?
That is the crux of it isn't it. I'm picturing three options , 1/ a three minutes taxi onto stand with a normal disembarkation 2/ An evacuation and 3/ holding off the bay and getting stairs brought to the aircraft. Options 1 and 3 are able to be upgraded to evacuation.
The premise of the scenario is that neither Fire Service or cabin crew have noticed anything unusual.
Thanks for your opinion, food for thought.