How to do gray IP tunneling through VPS?

Question

Mikrotik

Given:
at home:
- MikroTik hAP lite router
- a server-torrent downloader on Debian 8.3 is connected to it.
- all this is behind a gray IP.
in the "cloud":
- VPS with a white IP (also Debian).
- A domain connected to a third-party DNS server.
I want to make it so that when requesting subdomain.example.com, the request goes to the VPS, and from there it is already tunneled home. How to do this?
At the same time, the site is already hanging on subdomain2.example.com.

Answer 1

1. Any vpn from microt to VPS
2. Further proxying to Apache - by host header