Japan Life

I was thinking about going for the trail or at least a part of it by bike at some point, but I wondered if anyone here has done something similar before? I'm not religious and would rather do it for the experience and to get to know Shikoku better. I'm not sure whether this would be considered offensive to practicing buddhists in any way and I don't want to disturb people in their religious activities. But it seems like some people have done this by bike before, so maybe it's ok (looking at the paywall of a Japan Times article)?

I'm a moderately fit cyclist, I've done multi-day tours before years ago but not in Japan. So I'm also a bit unsure about steepness and weather conditions. Roads are probably in a decent condition (?) My options are an urban foldable bike (I kind of like that idea) or renting a decent one (probably better in reality).