I have no experience with this, but happened to have seen an interview with Ludwig Minelli, the founder of Dignitas (an organisation for assisted death). The man is 90+ and still fighting for this right. I believe I saw it in a video format, but I think this was the interview - I think it’s worth a read.
I’d suggest you look up the contact for the various organisations and reach out with your situation and questions to see what they say. They’re likely to be much better sources of information.
I haven’t used tailscale to know how well it works but as a current zerotier user I’ve been considering moving away from it.
I actually love the idea and it’s super simple to set up but has some very annoying pitfalls for me:
Pretty much all of the issues I’ve had were with devices that have to disconnect and re-connect from the network and/or devices that move between different networks (like laptop, phone). On my router, it’s been super stable. Point is, your mileage may vary - it’s worth trying but there are definitely issues.