So basically what I want to build now is something where you can take your Mastodon export, and then turn it into a static website, prefixing all your posts as if they were fedi posts.

[oliphant@oliphant.social]

@lmorchard has one option here:

GitHub - lmorchard/fossilizer: A static site generator for Mastodon exports

A static site generator for Mastodon exports. Contribute to lmorchard/fossilizer development by creating an account on GitHub.

GitHub (github.com)

There's also this, but I haven't tried it out yet:

https://tootviewer.netlify.app/
https://github.com/cfjedimaster/tootviewer?tab=readme-ov-file

[oliphant@oliphant.social]

@lmorchard Aha! Didn't see that.

[oliphant@oliphant.social]

The exported data will be in the ActivityPub format, readable by any compliant software

"Any compliant software" is doing a lot of heavy-lifting here, Mastodon.