Thinkpad T14 gen 5/6/current should have AMD APU, has a 4k OLED, and 2 sodimm slots.
Unfortunately T14 is NOT > 14.5" Display... I would prefer a 15-16" Display (I'm getting old and my eyes are not as good any more), but all of these have a numpad, except the Thinkpad P1 which is only available with Intel and pretty expensive. So the only Ryzen > 14.5" Display option without numpad might be the Framework 16 or maybe some other non business or niche brand.