...and space for adding in store food purchases at end of day--thats why even with a minimalist setup, its nice to have some spare room to temporarily add in groceries.
...of gearing from 23-88 gear inches. This "gear inch" term is still a good standard to look at, as you can see in black and white what your gearing is. Here is a chart with your bikes setup. I've toured a lot with varying loads, and 23 is still too high for me, its nice to get a bit lower, but having a 1x drivetrain, you are always limited in compromises.
The above setup was first trial, just a one week trip to visit friends via train, no camping gear. Just after conversion from 1X folder to 2X, amazing difference, now 400% range, all added range was low, 50/34 x 11-30 x 20"/406, 21-85 gear inches (I agree, don't need a higher gear, I have just enough to pedal down mild downgrade, steeper and I'll coast), but I may need a touch lower low if touring heavy and long hills. Fat seat tube prevents 3X crank, I'd go with a larger low on the cassette.
For this trip, I put daily food in shopping bag hung from the aero bar which sat flat on the top deck of the minimal brake post rack in front, see pic.
For minimal additional space, the OP might also use a "front block adapter" that clamps around the head tube and provides a Brompton or Dahon style front block for rack mount; What's nice about those is that the mass is not steered, but stays fixed. Some put their whole trip bag there, but on the OP bike, that might interfere with the handlebars and bag there. (On 20" folders, the space between the front wheel and handlebars is HUGE, a bonus for cargo. I've hauled there, a boxed, folded frame for same bike, quite a large box, that was lashed to (steered) fork rack and tall handlepost.)