A Plea for Help: Japanese Proxy Shipping Specifically from Beams

I desperately want this RRL × Beams denim Workshirt collab (https://www.beams.co.jp/en/item/beamsplus/shirt/38110739770/?color=78) and have tried practically every proxy service under the sun - but Beams seems to run a tight ship, and all of them refuse to buy from Beams as a result.

I'm open to any ideas - however questionable - at this point.