Policy Based Routing (PBR) is typically only found in Enterprise class hardware. It’s fortunate even the premise of it is replicated in any way into OpenWrt. As to GL integrating it, well… :
In Research
For these requirements, we have to research the technical solution or evaluate its impact on other features. So we can’t promise to these.
Optimize VPN policies to support multiple VPN clients at the same time and use composite VPN policies.