How to duplicate WordPress home page with different url?

Question

Nginx

Situation:
there is a self-written site not in php, on which there are several pages. Installed WordPress for the blogging part. As the main nginx web server.
Because the main page and a few more pages should remain old, then I hardcoded them in the nginx config via location = / . Accordingly, everything that does not fall on hard-coded locations is processed already on wordpress.
What is the question - I would like the main page of the wordpress theme to be available at some url, for example domain.ru/blog ; at the same time, other wp pages would not contain "/blog/" in their url, i.e. so that the address is domain.ru/example .
So far I see 3 alternative implementations:
1) redirect with url substitution at the nginx level (specify location in the part where requests to php are processed);
2) creating a duplicate of the main page using wp itself (not sure if it's possible);
3) move the wp root to the domain.ru/blog level in the wp admin panel, and then remove it from the /blog/ url in all other requests to the engine through nginx.
Actually, the question itself is which of the methods will be correct and how to implement it?

Answer 1

why complicate it?
make an arbitrary page with such an address, then change the necessary links in the template so that they lead to it