Why not just use a Atom-based NUC? At 10W TDP (and mostly at idle for many uses), other power draws become more important anyways. Modern Atom's are surprisingly competent.
Gemini Lake Atom NUC: https://www.intel.com/content/www/us/en/products/boards-kits...
Apollo Lake Atom NUC: https://www.intel.com/content/www/us/en/products/boards-kits...
On the consumer side there might be less, but the Gigabyte Brix, ECS Liva, and the Zotac mini-PC lines seem to be running strong and have a full line of TDPs - Zotac's latest P-series units look pretty great for their size: https://www.zotac.com/us/product/mini_pcs/zbox-p-series/all