You may check X13 AMD Gen 2 which has 32GB soldered RAM option. Although I am not sure how much it differs from X1 Carbon. Anyway I prefer a bit more screen real estate so went with T14 which is still very portable too and gets up to 48GB RAM. What I miss is lack of TB4/USB4 support to plug in eGPU. Some rumors say AMD Ryzen 6000 line should have it.