So sorry to hear this Kev.
Your award at the last National Rally for your bike is a great memory.
But as Marcus said, train travel (& bus?) may be an option, especially with the Vic Government reducing fare costs to metro Melbourne prices. Just need timetables to align & maybe a bed? Would be cheaper than riding, just not as much fun, although you'd stay dry. (Have to say, thinking about driving to Ararat, then train to Melbourne & rellies place - a lot cheaper!)
If you need tech to help you, organisations such as Vision Australia & various other vision agencies (not sure whether you have other organisations like Royal Society for the Blind or Guide Dogs in Vic) should be able to help from the information you've provided. It would be worthwhile if you could see what is available to you either through GP or Council's Community Service area - an Occupational Therapist could help out generally.
Are there any medical or surgical options available to you?
Keep us posted.