Why not route traffic through the VPN via your router? Should be pretty easy with Mikrotik
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The problem seems to be your router. If you can install OpenWRT at all (check the supported devices), I would be surprised if it wasn’t more reliable that whatever OEM router software is already on there. The upshot is you can trust your router.
I agree, I have an ASUS router with Merlin FW and there is multiple VPN client on it and it can handle all this automatically.
btw wireproxy also supports http proxy. i’m not sure how efficient it is, but i use it daily for having different vpns on each firefox container tab.
I dunno if this is a proper way… However I remember I did a similar thing to route all my traffic from all my devices to protonVPN’s free tier.
I can’t remember exactly how, but IIRC 2 wg connections where used (wg0 and wg-ext) and with some iptables rules I was able to route all traffic from wg0 to wg-ext without issues.
While I can’t exactly remember how, I think I still have the config files arround if you’re interested I can dig into my old backups :)
No particular experience with the VPN issue so feel free to completely ignore this idea, but if you do have to stick with something resembling your current solution it could make sense to put it in a VM or container so that the process of rebuilding it is not so burdensome.
If you can run WireGuard on all your devices, you may wanna set up a multihop node that forward outbound traffic to the VPN tunnel via that hub
