Are there currently any Substack replacements that integrate with ActivityPub?

So I'm currently looking for a Substack substitute for taking donations.

I'd want it to feature a blog (and preferably newsletters too) that include a mix of publicly-accessible posts, as well as posts that are only visible to donors.

And ideally, I want it to also integrate with ActivityPub too.

That might mean a Fediverse post is automatically generated when a new blog post is published. Or potentially the publicly visible blog posts are published in full to the Fediverse.

Now, I know there are a few donations platforms that can handle the first part, such as Ghost and Ko-Fi.

There are also blogging platforms such as WriteFreely/Write.as and Micro.blog that integrate with the Fedi.

And in theory you could do both with a WordPress blog and number of plugins, some paid. But especially with paid plugins, that's likely to get quite expensive quickly. (Not to mention some of the questionable things that have happened at Automattic in recent weeks.)

But are there any platforms out there that support both?

Or is the best option at this stage just to get a Ko-Fi/Ghost account for the donations and donor-only posts, with a separate micro.blog or write.as account for the publicly accessible posts?

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