Scaling Temple of Mysteries for 2-3 players? (SPOILERS AHEAD)

[rom90125]

I'm running Malhavoc's Temple of Mysteries tonight and I will only have 3 (possibly 2) players. Given the special nature of the pregen characters used in this adventure, I can only allow each player to manage one character each. Do you have any suggestions on scaling this adventure for a small party?

Thanks.