In the FAQ (which @LitBomb recently updated), it says 3.6. Q: The first byte of my repeater's public key collides with an exisitng repeater on the mesh. How do I get a new private key with a matching public key that has its first byte of my choosing? and then shows how to change the public key and choose an arbitrary prefix.

I have some more questions about that FAQ entry:

• What are all the consequences of such a first byte collision?
• Assuming that there are more than 256 repeaters in the mesh (I can see this happening with a European mesh), and every possible first byte is already in use, how should you then choose what a new repeaters first byte should be?