Anecdotal, but my wife and I also found this the easiest process compared to K1, AOS and ROC. We are not sure, but I believe it helped that my wife had her I751 pending when she had her N400/I751 combo interview. Since our IO in Detroit had my wife’s I751 package in front of her, and I was also present supporting my wife, the IO did not ask for any of the marriage information my wife had with her (back in 2018, there was no requirement to upload all that information, it was only required for the interview). Also, the IO conducted a very brief, less than 5 minutes, I751 interview with us to verify the I751 info, and update any info from the filing date about 1.5 years earlier.
Overall, your plan seems solid, you should be fine. Just a note, Detroit moves pretty fast, so when you do get your interview notice, if the I751 is still pending, upload a note requesting a combo interview.
Good Luck!