Jelllyfin + Subfin (https://github.com/williamkray/subfin-plugin) works well, I’ve been using it with the OpenSubsonic Android apps listed in https://www.navidrome.org/apps/?platform=android&api=opensubsonic without issue. e.g. Substreamer, Tempus, Airdrome, etc. all work fine with Jellyfin + Subfin.
I’m guessing you’re not on Android or iOS since Jellyfin has apps on those platforms - but you should be able to use any Subsonic/OpenSubsonic app once set up with the plugin.
Maybe that’s specific to UK? I’ve never had to upload ID at any of the general domain registrars but am not in the UK. Maybe you’re looking for a registrar that doesn’t do that for UK residents, specifically. (or you might need to use a VPN or something, dunno)
Privacy aside most people tend to buy a domain at the cheapest registrar (keeping in mind whether to renew at that registrar later or transfer out to a new one when the time comes). There are domain registrar sites people use for comparison, been a bit since I’ve needed to shop around but sites like https://tld-list.com/ can be helpful. You could try doing a lookup there and work your way down the list until you find one you like.
Or if you’re really set on looking for a service that actually advertises no KYC then looking through this list may help https://kycnot.me/?categories=domains (njalla is one of the listed ones there as someone else mentioned).
I made the jump to OPNsense recently, ended up buying a Protecli to install it on and its been working great so far. For me it sort of made sense since I wanted to have a little purpose built fanless system with Intel NICs, and Coreboot and Console access via USB are nice bonuses too. My original thinking was to try running other services on the same hardware (using Proxmox maybe) but for now it just runs OPNsense and nothing else… maybe it’s better for the network firewall to just be the network firewall, it’s the one thing I don’t want to crash and have an outage with.
But you don’t have to do that, pretty much any Intel/AMD based system with multiple Intel NICs should work with an OPNsense install. The other mini pc vendors will be a bit cheaper for sure, just be mindful of RAM and storage prices right now.
Are you asking about music, or audiobooks specifically? I haven’t tinkered with audiobooks so am not sure if that’s handled differently…
For music I’ve been using Jellyfin as the server. On Android have tried a bunch of different apps, substreamer and Symfonium are the better apps. But I also like Fintunes, Jellify, and Resonus.
Fun fact: You can use most OpenSubsonic / Subsonic compatible apps with Jellyfin once you add the Subfin plugin (https://github.com/williamkray/subfin-plugin).