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hippy
gbj_tester
Serious answer: I think a bridge is going to experience severe bending loads, so making it thick enough to resist them is going to push up the stack from extension to elbow cup. If I had the same issue, I'd probably get Fibrelyte to knock something up in flat 5mm thick crabon fribé, but it might break. Given their very reasonable pricing and fast accurate work, I'd consider that a worthwhile punt, likely to be ~£30 based on what they've charged me for similar work before.
A U-channel which wrapped over the J-brackets would be stiffer but much more expensive to fabricate in CF, and probably still ~£60 if you CNC milled it from aluminium.