Hi OP, very sorry to hear your news. Healing vibes are heading your way right now! 🙂
An Occupational Therapist (IANAOT) approach to this would be to adapt your tools to allow you to carry on with your preferred activity. As such there are bikes (like Dutch bikes) out there that would allow you to sit with your neck in a neutral position- they may not be fast but they will be comfortable! And if they allow to get outside and see the world from two wheels and under your own steam (which, at the heart of of it, is why we all love bikes, right?) then they may be worth looking into.
I know it’s a big change and an awful lot to take in and process right now, but everything that we have ever achieved as a species has always stemmed from our uncanny ability to adapt, right?
Stay awesome 🙂