Hi there, (long reply, but not easy to find this info) looks like you are in similar situation as me. I sold my 2016 Yukon XL SLT 8 passenger and with current family needs wanted to get 9 passenger, but at the same time I did not want to miss on many useful features. I was debating to order SLE, but looking at the dashboard and all controls I saw that it may not be difficult to swap the console into a center seat. I wanted to order Denali XL diesel to get all options including magnetic ride and adjustable air-ride suspension, but was told they had a hold/restrain on 3.0l diesel, so I was looking around and found a 2021 Suburban RST 3.0l diesel with technology pkg, and sunroof, $70k MSRP, with with most options that I wanted. (it's only missing front cooled seats, magnetic/air-ride, and adaptive cruise). I bought it and also found a leather center seat from Chevy pickup truck on ebay for about $350 or so. I did the swap, but it turned out a little more complicated than I was expecting, but not too bad. I am very happy with results, and I now actually ordered 2022 Denali XL and once it comes I will try to sell the Suburban, with current market, if it stays about the same, I should be able to get my money out. (message me directly if you want more info and part#s for what you will need) see pictures of my front row
And here are the options I really wanted to have that are not available on LE/SLE: leather, heated seats front and rear, heated steering wheel, power folding/release 2nd row and 3rd row seats, power trunk lid with handsfree sensor (useful feature), Bose system (although you have to remove subwoofer that is under the console, and i plan to try to make small custom box that would fit under the seat to put it back, but it sounds ok without it, just less bass), panoramic sunroof.