This explicitly doesn't answer your question as written, but just in case it's relevant to you anyway: you can run something like pfSense in a VM on a server or

This explicitly doesn't answer your question as written, but just in case it's relevant to you anyway: you can run something like pfSense in a VM on a server or really any machine you have available on the network where you want an exit node. At least on Linux, the software networking support is good enough to make such a VM appear as just another machine on the network the VM host is connected to. My primary home router is a pfSense VM set up as a Wireguard peer for tunneling in from various other devices and locations, and I'm very happy with it.