UniFi IPSec Remote Access Setup

I need someone who knows UniFi routing inside-out to configure an IPSec tunnel that lets me reach my internal network securely from outside the office. The sole purpose is remote access, not a site-to-site link, so the configuration should be optimised for laptops and desktop clients that will connect from varying locations.

The UniFi Security Gateway / Dream Machine is already online; i already have an IPSec tunnel to a remote office. However now i want to use OpenVPN to connect to this Unifi Dream Machine and reach the remote office network.

I.e

LAN OFFICE1 = 192.168.50.0/24
OpenVPN NET = 192.168.20.0/24
LAN OFFICE2 = 192.168.100.0/24

There is a current IPSEC tunnel between LAN OFFICE1 and LAN OFFICE2. We can reach LAN OFFICE2 from clients connected on LAN OFFICE1. But when clients connect using OpenVPN to LAN OFFICE1 they cant reach LAN OFFICE2.

I dont have full access to the firewall on LAN OFFICE2 since its our hosting partner. I have full access to our LAN OFFICE1 unifi dream machine.