Not massively helpful but just to confirm the Mezcal recommendation (2.25inch for me). The wife runs Rene Herse Fleecer Ridge, which are within your width range. She really likes them. Expensive though...
Last summer I rode the King Alfred way (probably 70-80% off road, mainly bridleways, some single track and sandy sections) on Panaracer Gravel Kings (1.9 I think) on my aging gravel/cx bike.
Very fast rolling and seem pretty tough, but I'm glad it stayed dry, as they would probably be rubbish in the mud!
These Vittoria Mezcals look like a good halfway house.
I used cross and mtn kings years ago and liked them a lot. currently have some mezcal's which are equally good. I think it mainly depends where you plan to bike pack. For example if it was fairly standard variable it doesn't particularly matter. But if it was really rocky for example I'd make sure the tyre wasn't too lightweight given the extra weight. Equally if a bog / mud tour I would stay away from the cross kings... I think Mezcal's are very adaptable and would be fine for most stuff.
I'm going to reccommend Vittoria Saguaros having ridden a pair for the entirety of the Tour Divide a few years ago. Fast rolling, plenty grip, come in a variety of sizes.
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