I’ve run 305/70/16s on 10” -25 offset for years, and had no problems with popping beads Offroad.
It all depends on what type of terrain you run on. Here I find I don’t need to air down on the offroad runs I do, they‘re loose rock and bare soil trails mostly, so I’m not crawling up steep slab rock, where airing down is almost a must.
I‘ve actually gone the other way recently, changing from 305 muds to 285/75/16 KO2s, but keeping them on 10” -25 rims, and it’s working just fine. They measure a tad under 33” diameter, so I’m happy with that.
I must admit, with the 305/70/16s, I did have occasional “white-line“ issues, mostly caused by deep kerb water on one side of the road (pretty common here on Romanian highways) and deep HGV ruts which are even more common here, because they have too much bitumen in their asphalt mix designs, causing rutting in the summer heat.
Let us know what you decide on, it would be interesting to see what you come up with and how they look... and perform.