I know it’s not an ideal solution, but you could make that possible relatively cheaply by fitting the TEC cam, and going up a tooth on the drive sprocket. It would ameliorate the cruising speed without compromising the design parameters or usability - and would be more than paid for by only needing to run the one bike.Many of us that found the Himalayan bought because of what it is, and what it isn't. I couldn't own it if it were my only bike because I do need to travel sustained 65 mph from time to time. For me it is a great bike to explore and find new roads and paths.
I not saying you would want to do it, but it is an option available to you.