The biggest concern is the pin plug and circuit pin sequence where the harness meets the airbag clockspring. I'm currently in the middle of such a project on my 2017 Buick LaCrosse, swapping a C8 Corvette wheel. The physical fit is no problem and the harness plug is identical, but the pin sequence is different and will take some sorting to get everything to work...but it looks great!
I'd actually be curious to see how much smaller a Traverse wheel would be over the Blazer. I mention this because I initially thought the C8 wheel would be smaller in diameter than the stock Buick but actually they're almost identical in size, just different shape.