BOAC:
The kind of "fail-safe" override you propose utterly negates the whole point of the automated protections (speedbrake inhibition placed there to prevent another Cali incident - where the pressure of suddenly finding themselves lost *and* in a canyon below MSA meant the pilots forgot they had deployed speedbrakes and couldn't climb out of there even with firewall thrust). Also as has been pointed out, even if the TAM crew had spoilers, in those conditions they would still likely have left the runway.
And in answer to your question, the option they have is one that, rumour has it, too few pilots seem to exercise these days - if the landing looks dicey, go around - divert if necessary.