"Year 1 of our Lord" (A1D) and "our Lord's year 1" (DA1) I'd give you. But "1 In the year of our Lord" (1AD) and "Of our Lord 1 year" (D1A) seem far too convoluted. However I'm familiar enough with the German language to know that its syntax is often out of phase with English. I'm not characterizing it as wrong, mind you (each one is correct within its language), just not the same. But the argument that "nobody would recognize any more what A and D stand for" is pretty much invalid because the overwhelming majority of people already don't know what they stand for.