The short answer is no, it is not possible.
We do no white-label any part of our system. Our brand has always to be represented when our service is in place. That being said, we allow partners to co-brand the service with their own brand. On this regard, you can find the necessary guidelines on Donkey Republic Branding here.
This is why our kit comprise marketing materials and elements that you will need to use in order to Donkify your bicycles, turning them into proper Donkey Bikes. The more visible and recognizable the bikes and the hubs are, the easier for customers to spot and use them.
Needless to say, you are welcome to ask us for more Marketing material.