Bringing a new character in while in the boneyard.

[Laveral]

I am looking for info or idea to bring characters in while in the boneyard and Roslar’s Coffer. I started The Dead Roads last night and brought the group directly into the tomb to start. I tried my best to make it a surprise, and the group is definitely wondering what happened and what is going on. I have 7 players right now, but one of them was not able to make the game last night. I’m wondering how t bring his character in. The group got to A10 last night, and the Bloodrager actually put the wig on and could not make a will save. It was funny.
My idea is to basically make it to where the boneyard is still in the process of sorting through all the people that died, and they will have the ones that have the obols land in any empty tomb. So, the incoming character could wake up in a sarcophagus that was previously occupied by another PC. My other idea is that they could appear in any empty sarcophagus or tomb that was in Roslar’s Coffer. This later idea could possibly help if characters die at some point in this adventure, but if they die later I’m not sure how I will bring them in and make the situation important to them.
Any ideas are welcome for this, thanks.

[Almarane]

You could use Umble and Thoot. After meeting the PCs and seeing their obols, they could think that something is amiss and start searching for other Roslar's Coffer's lost civilians' souls accross the Boneyard, and thus bring them to the rest of the group if they are still in the Boneyard or guide them through the Dead Roads and making them reappear near the PCs' location in Golarion (since Mictena is not a menace anymore at this point, it would be easier for them to leave the Boneyard).

The scenario also suggests using Jando Parr (book 2) as a replacement PC, with some adjustments : he was close enough of the Radiant Fire to get an obol, but not enough to be killed.

For making the situation important to them : since they have obols, they should come from Roslar's Coffer, so they have the same reasons to be sad/pissed as the rest of the group. Depending on when this new character comes in, the rest of the group can fill them in with the infos they learned to further push them in the right direction.