Intriguing no matter how you think about it. I'm definitely curious as to what the price ends up being.
But if the reason for this is to help with selling AM4 motherboard inventory, maybe it's that the prices of those boards aren't coming down to where they should be? I was recently looking at getting a board to give my son's old 1600AF a home, and the price, even of budget boards, was more than I was willing to spend new, and used prices were sending me back looking at the new boards again.
I lucked into a new (open box) B450 board on Ebay that was close to what I was looking for, with a price I was happy with. But that really was luck/good timing. It was cheaper than every used AM4 board I'd encountered thus far, outside of proprietary HP/Dell/etc boards.
EDIT: I should specify that I was looking for A320, B350, and B450 boards, as wanted to have the option of the full range of AM4 CPUs in, rather than having Zen/Zen+ cut out of the picture.