Couldn't find a picture of a Birdy with the expedition rack.
But the titanium rack is exactly the same, below a Birdy with titanium rack. Yes, you can wheel around pulling the bike from the front (the best is pulling it with the low ride rack that become a handle when the bike is folded).
You can mount a Brompton front block adapter to the Birdy:
https://bikegang.ecwid.com/#!/Brompt...tegory=9988082