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Hey, just stumbled upon your thread and wanted to share my 2 cents in case you still need help. Tbh, I'm not familiar with linode servers, but I have installed opnsense on a VPS before. It's definitely doable, and there are a lot of tutorials out there to help you get started. As for your idea of using virtualbox, that could work too. I've used virtualbox for testing before and it's pretty straightforward. Just make sure you set up the network settings correctly so that your virtual machines can communicate with each other and the outside world. Regarding the ovpn files, you'll definitely need to change the ishosting IP addresses to match your linode server. And if you're using a non-standard port, make sure to specify that in the ovpn files as well. Hope this helps.
