I just talked with the person from the dealership where I'd ordered the SD/Vario/GX bike (The New Wheel in Larksbur, CA). The New Wheel was returning my call after checking order status: whether it was too late for the switch from Vario to Rohloff. It was too late -- the bike is already in a container about to be sent to San Francisco Bay area. The person did assuage my anxiety some. He pointed out that the Vario is a smoother shifting mechanism and with the motor firmware upgrade (to be out by July 20th -- at least that's my understanding --https://electrek.co/2020/06/25/bosch-electric-bicycle-power-upgrade/) the Vario should do okay on steep climbs (though will require more effort than the Rohloff). I was also relieved some by watching the video from the fellow in Luxembourg going up a 20% grade (huffing and puffing some that John posted earlier in response to my question). Near where I live in the San Francisco Bay area is a VERY steep road, Marin Ave, and this link indicates that the street has a 25% grade:
https://john-s-allen.com/galleries/berkeley/slides/00Marin Ave.html#:~:text=Marin Avenue&text=Marin Avenue in north Berkeley,the entire San Francisco area.). Marin is indeed VERY steep, so I figure that with the firmware update, I should be fine (unclear about whether dirt vs the asphalt road makes a difference in going up the same steep grade). Another note: The person from the New Wheel indicated that though my bike is now in a shipping container, he can’t make an estimate of when the bike will arrive, and this may be relevant for others: Due to COVID, Riese & Muller is having delays getting their bikes through customs.