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Maybe give Zerotier a shot. Similar premise as Tailscale, but a simplified NAT and routing implementation.
My overall question though is...why??? If you have access to a VPN, why would you connect to another location to use it when you can just use it from anywhere?
I had success using openVPN. I set it up, generated certificates, installed it on my phones, tablets, and laptops.
It won't work when using an external vpn like Express or Mulvad, but while using it, you have secure connection to home. Once done with the home network, turn off the vpn, turn on your commercial vpn.
Two cases.
One to have my server connect to the internet without exposing my traffic.
The second is to not have to chose between be connected to my server or be connected behind a VPN.
Honestly, if if wasn't because tailscale is performing badly for the last few months, I wouldn't have problems using and even paying for it.
I did follow this guide to use WireGuard to connect to my homeserver and use my internal pihole and then connect to the internet with protonVPN.
I use Zerotier. I have a rpi sharing my Linux isos through a commercial VPN. The RPI has Zerotier as well as my other devices, so I can connect to it from anywhere as if it was on my home network.
Tailscale has the funnel command which exposes services like how you describe, but that's off the table.
Not quite sure I understand your layout, but if these are separate VPNs, you could run one from the server with a port forward (guessing that's not through Mullvad as they don't offer forwards any longer - to my knowledge) and then setup the general VPN on your router perhaps so you don't have to change ip routes for the whole network. You would still probably need to setup an ip route specific to the server VPN traffic on the router at that point, but that would probably be less work.
If this all being done from the same device then you would need to separate them out by IP routes.