To be clear, this post is on (one of my) blogs, which is on Svbtle. The main site is what I ported. I like Svbtle, and maybe will move all of my stuff back onto the main domain, but haven't felt the need just yet.
Most "redirect" stuff is "point a DNS record somewhere"; so I have the 'www' subdomain pointing at Cloudflare, the 'words' subdomain pointing at Svbtle, I think 'blog' is pointing at... heroku? Before I moved www to Cloudflare, it was pointed at Netlify, and then gh-pages before that.
I've been meaning to check out the new Cloudflare registrar, but there's only so many hours in the day :)