I don't know Squarespace. But I assume you have a domain name registered with a registrar somewhere, and that in that domain's DNS records you have an A record that points your http://www. subdomain to your Squarespace IP address.
What I wonder would work is if you had a second A record which points your http:// root domain to some other host which hosts your Nostr records.
I don't know that this is possible or that this is what your setup is, but it could work.
As for setting up your Nostr records on a separate host, I have a blog about how to do that with Sveltekit and Vercel, NVK has another on how to do it with GitHub pages.
In summary if Squarespace doesn't support it, you may be able to work around it using your domain name DNS configuration.
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