Maybe, not your cup of tea, and sorry to sound like a broken record, but ... I can't help but think that most of your concerns over how that bike might work for longer touring would be nicely addressed by just packing ultralight. I have not found at all challenged or uncomfortable on long tours by any lack of comfort or "stuff". I carried 14# of gear camping and cooking on the Southern Tier and I have since trimmed the gear weight a few pounds while actually adding a bit of comfort and versatility to the camping gear. It was an evolution to get there and maybe isn't something most folks want to or even can just jump directly into, but I am convinced that if folks made the effort they would be surprised just how comfortable they can be with how little "stuff". It really can be a joy to travel with just 10-15 pounds of base gear weight even on a multi month camping/cooking trip. That kind of packing style would allow you ride the bike you are considering on pretty much any length tour.

The exception is when/if you need to carry multiple days of food and water, but that can sometimes be planned around by using food drops/caches or sometimes minimized to just a short section here and there and carried on your back if just for a day or two.