Wow. This is a really interesting question. I’m not visually impaired myself. In this case, I’m not familiar with how easy or not the Fiverr UI is to navigate with a screen reader. That said, I imagine it would be very difficult.
I think that your best option here would be to type up your gig descriptions in a word document and with each, detail what prices and package options you would like to offer. I’d then send this as an attachment to an email to customer service. I don’t have their email address on hand, but maybe someone else can post it.
In your email itself, I’d explain your situation and ask if it would be at all possible for someone on their side to create your gigs for you.
As far as I know, this is the first time this subject has come up on the forum. In this case, customer service may not be able to do this. (I’m just speculating.) However, I would imagine that this may be possible and I would hope that thy would be keen to support you.
If this is possible, your next (and hopefully) last problem, will rest with creating and uploading images or videos to promote your gig. On that note, though, I’m sure that if you created a thread here on the forum explaining what you do, people would be happy to help create images for you. There is even a poll feature you could make use of to have the community vote for which designs they think are the best.
I hope that these suggestions help. Also, please keep us updated on your progress. It will be interesting to follow your story and I sincerely hope you do find a way to start selling.