Upload & Sell: Off
Many working pros don't know what the going rate is for usage, nor do many of them even know about usage which is partly why usage is disappearing. The misinformation of the current photographic industry is staggering. But this doesn't matter, nor does it matter that anyone with an ultra wide and decent processing skills can create this. You created this with your ultra wide and your processing skills. It's special because you did it. If a company or government entity or non profit wants to use your image, they simply need to pay you because they can and they have money. I would just quote them the use of the image, web only on the single page you mentioned, unlimited time period, non transferable to anyone else for $300 and see what happens. If they balk at it, just simply ask what their budget expectation was. If they say zero, then it's up to you wether you value your work on not.