That works if you're ok with halfling and gnome PCs taking on the challenges of Alastor Land, the iron sphere trap, and possibly the choker alone.
Honestly, I think the better solution is just to change the dates a little.
--Erik
Actually, if they don't know better than to split the party in a dangerous area and get 1 or 2 members of their group killed alone, I'd rather they learn their lesson now at 1st level.
I say let them do it alone and either survive narrowly or die in the process.