It took some time but I now have a Japanese New 3DS LL with a North American motherboard. Was finally able to bring my original Ambassador Certificate to it. : r/3DS
New Nintendo 3DS XL LL Super Famicom Edition Console Box Japanese ver [BOX] | eBay
Nintendo 3DS XL LL Black Console Stylus Japanese ver [H] | eBay
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Nintendo New Nintendo 3Ds Ll Metallic Red New
USED Japanese New Nintendo 3DS XL LL PEARL WHITE only console RED-001 | eBay