Not actually convinced after test riding the Bobike Mini+ & Brompton combo. Before u lineup your cards for this setup, I strongly recommend testing it out in store yourself. I still prefer
A-Head Adapter plus - Bobike
Bobike A-Head Adapter, Black | Bikeinn
Bobike Mini Child Seat with Bryan Adapter for Brompton, Sports Equipment, Bicycles & Parts, Parts & Accessories on Carousell