I have recently purchased an old, second-hand folding (or at least collapsable) bike, a Daewoo shuttle to be precise. In order to use it for commuting, I would like to fit a pannier rack onto it. It has very small wheels (16") and so I was thinking of a seatpost mounted rack, preferably with quick release. Unfortunately, the seatpost diameter is quite large (about 35mm, maybe a touch more) and the one rack I bought (https://www.amazon.co.uk/gp/product/B01DUAMLDA) didn't fit because of the seat post diameter being too large.
I have searched everywhere for a pannier rack that fits large diameter seat posts, but have drawn a blank. Can anybody suggest any pannier rack that would fit or any tips or tricks to make a standard pannier rack fit onto a large diameter seatpost?