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@andyp
50 inches is not that low a gear for a sustained climb. Generally for a climb that long I'd be using either 36x23 or 36x26 which is between 36 and 41 inches. I think you might gain some efficiencies from riding fixed but I'd still gear down if at all possible. That said, you'd probably get up on a gear of 50 inches but your knees might not thank you.
I assume you're going to do some tests before you commit?