Use existing gerbil connection for other tasks?

[philnagel]

In my case, I want to set up a split-horizon DNS and a local reverse proxy so that request from my local network do not need to go through my VPS. For this to be as transparent as possible, I want to sync the certificates generated by traefik/pangolin to my local reverse proxy. Since gerbil/newt already have a VPN established, is there a way to have a post-renew script within the ecosystem that can tap into that existing connection? It would just need to be able to reach a local machine via SSH.