Yup - I'd just keep it as a 'survivor' if it is bone-stock and in as good condition as the pics suggest. Leave it as if you'd never sold it and just taken care of it for the last 40 years.
Then when the time is right pass it along to your son or grandson/daughter if they're in the picture.
That being said, there's nothing wrong with swapping out some parts to make it a little more of a cafe without cutting it up. Clubman bars, different seat, different exhaust, smaller turn signals/lights...
All of that can be done while keeping the original parts in dry storage in your house. They can always be bolted back on and will be in the same condition as they are today which is a bonus if any of it is hard to find.