This might be solvable with some ferrites. First up, these: https://www.dxengineering.com/parts/dxe-csb31-525-5 These should go on the DC out from the Meanwell brick...open one up, loop the DC out line around it a couple of times right next to the brick, then snap it closed. That'll kill any RF on the DC line before it gets into the cab.
Next, you'll want two of these: https://www.mouser.com/ProductDetail/LeaderTech/SA28B0071/?qs=70SGE8EoboRwQl%252BZe6ev%252BQ%3D%3D One goes on the ribbon cable near the busboard, and the other on the cable close to the module itself. This way, anything that CAN get onto the power line either won't make it off of the busboard, or if it's RFI inside the cab getting onto the ribbon itself, the ferrite by the module will stop that.