The Ortlieb trunks deserve a closer look. If you take a look at pictures of my bike, you'll see the fender rises a bit above the pannier rails, so my only question will be if the mechanism Ortlieb uses will permit that height difference. Might be worth an Amazon order. I've had their products before on my recumbent trike and I know they are high quality.

If I were a bit more mechanically inclined, I'm quite sure an afternoon with a welder and some steel rod would yield a more perfect solution.