That does seem like a good solution. A problem with posting to random platforms is the lack of durability - it feels like it could be gone at any time and that'

That does seem like a good solution. A problem with posting to random platforms is the lack of durability - it feels like it could be gone at any time and that's because it could be gone at any time. Writing first for your own site, and then either copying elsewere or linking from elsewhere at least preserves the original writeup. On many platforms there is a preference for very short answers (too long didn't read). So copying a very short version and linking to the full version seems like a good direction. It's not perfect because contributing answers are then locked on each platform. - But we can always link back to a few worthwhile, and summarize them on our own page. After that, traffic or not is mostly out of our control.