I would not agree with your assumption that the last second or two makes no difference, the Manchester report suggests otherwise.
- no - you have misread it! 4.3 refers to 'clearing the runway', not turning AS YOU STOP. The stop takes a finite time. That cannot be reduced. In the last 'one or two seconds' the a/c can be turned. That is all there is to it. No delay to 'clear the runway'. No delay in stoppng. No turning AFTER the stop. No delay in any subsequent evacuation. Let us not make this simple concept any more difficult than it need be, please. Manchester cannot be dismissed as "a very rare occurrence" - it was a severe fire during take-off, for whatever reason - yes, thankfully rare - but what we train for.
I do not know how deeply you are involved in 'evacuation decisions', but it needs a little careful thought - it is not just 'chuck them out' regardless since injuries will occur if you do. There is often a period of evaluation required, even following a fire warning. Such does
not require an 'automatic' immediate evacuation.