Double buggy that also takes maxi cosi carseat?

[Thandeka]

Due #2 in jan. Dd will be 23months. Contemplating doing sling buggy board combos but suspect will give in and need double buggy. Best thing I found with dd as a baby was just clipping maxi cosi onto frame and she would stay asleep. So was pondering if there was anything like this for double buggies?
We have narrow steps upto house so it needs to be an in Line one rather by than a side to side but any recommendations? I think I saw an iCandy one but dd was kicking off so didn't get to ask make.

iCandy Pear definitely does and I'm pretty sure the Peach does too.

ICandy Peach and Pear, Baby Jogger City Select, some Philand Teds, the B-Dual (with Oyster adaptors) and look at the new Mountain Buggy Duet which is narrower than the City Select but a side by side. I have to say I wouldn't attempt to get a tandem up any steps unless it's one step then a plateau, and then another ie not a rise of steps. They are long and heavy and with a child at the bottom you are likely to bump the seat.

A tandem would be difficult with steps too because of the length, they tend to pull down and forward so you would be dragging it up rather than bumping.

These all take Maxi Cosi-
Baby Jogger City Select
ICandy Pear
Britax B dual
P&T Explorer

If it's only a few steps up to your house I would take the baby off in car seat and put in house, take toddler out and walk upstairs with pushchair and toddler.

the Mima Kobi does too