There are many climatic issues with beekeeping in the North, and I have challenges that others don't have. On the flip side, I am very grateful that SHB is a nonexistent problem. To find a SHB infestation here would be likened to seeing a unicorn crossing the street at high noon.
That said, Mike, imho what you have there is a well thought out and innovative design! I can see that it does not add any restriction to the coming and going of the bees (very important) but seems to really funnel and confuse the beetles to keep them at bay. Would the beetle not eventually just figure out to climb over the ends of the device? Perhaps an improvement ... what about a sneaky beetle sized notch at a random spot in the lower that as they run along pressed up against it trying to get into the hive when they get to the notch they rush through it, where there is a sudden drop into a bottom slot and a tray below that the beetles would fall into, trapping them forevermore? Sort of like a variation of a pollen trap with this such device on it. ..... for consideration.