Yes, this isn’t a bad setup, but it is only on the browser. Which is ok.
Oh, and I did try out Tailscale with Mullvad and it really isn’t too bad! I miss out on some features, but I still do get to use NextDNS with my configuration, and get some privacy benefits from using something like Mullvad. 
I am a little concerned about the privacy standpoint of Tailscale though. I mean it is not bad (better to use Tailscale than making my Nextcloud public to the internet), but overall the payment proccess is meh. It would be nice if they accepted something like Monero (I can only pay with card regardless since I am under 18). Something more privacy friendly.
I guess now I have to ditch iVPN.