Passing multiple bridges to openWRT VM issue

What's your home country?
Czech republic.

I would use one or the other, not both. Tailscale traffic is fully encrypted. You could always buy a cloud server in your home country and run Tailscale on it.
Yeah, but then I don't have access to my home network.

Its fine, I just managed to set tailscale up as a bridge to a wireguard-protonvpn in the LXC so I have all I need, now I will see how it performs as I will travel next week.
 
Here's what I would do: Rent a small virtual computer from Forpsi or WEDOS in the Czech republic for like €1-€2 Euros per month. 1vCPU and 1GB of RAM is enough for just Tailscale. Install Tailscale and set it up as one of your exit nodes. Then the only thing you need is Tailscale. You will have a VPN with an exit node in the Czech Republic, and access to your home network (and potentially an exit node there as well) all with one tool