Yea, a couple extra helpful magic items in the beginning or maybe a few extra points for their point buy characters perhaps?
My only concern is that the higher level characters you mentioned becomes a self correcting situation. When they do start an adventure at higher level, after 3rd level they start earning LESS experience for each encounter. Usually the self-correcting nature of 3rd edition experience is a good thing, but in this case it seems like it could work against you.
I don't know if I can get 6 reliable players, and also I find DMing more players is much more difficult for me (and less enjoyable because I struggle more to manage everything).
I'm thinking maybe I will just "fudge" a little more on behalf of the players than I usually do running this campaign. If the players get in trouble when they did not do something stupid, maybe a few monster hit rolls will quietly miss instead. If the party was weakened due to poor luck or circumstances that are not their "fault", maybe the difficulty of their next encounter will be mysteriously toned down a bit and/or the monsters might not use all their special tactics/abilities quite as efficiently, etc.
I frequently do this to some extent when I DM, but I always try to keep it to a bare minimum. I'm a believer that characters can and should die occasionally, especially if they do something kinda dumb - but the game just isn't all that fun for anybody if characters die TOO often.
Seeing all the death reports in that campaign death thread has me a bit concerned I must admit...I really don't want to run a "meat-grinder" campaign... =(