I think the A6M3 Model 21 (or is it 22?) would be more competitive in the Mains. At the very least it would fill a nice gap for late-1942 (Model 32s began appearing during Guadalcanal) to late-1943, where the M2 is getting outclassed but the M5 is too late (VERY limited numbers of A6M5s until early/mid-1944).
But as AAA said, the Ki-43 and Ki-27 are MUCH more badly needed, as we currently don't have ANY IJAAF aircraft covering 1941 to early/mid-1943 (Ki-61 being a mid/late-1943 bird, IIRC).