True, the locking mechanism is not as important. If need be, I could attach with heavy duty velcro (like interlocking 3M, as seen with EZPASS mounts).
I have no idea what the cost could be from a metal shop, or what the process would entail, but if a 24" isn't available, I imagine I would inquire about shortening a widebody lockdown (cut, weld, 'blend to seamless'?), rather than starting from scratch.