After consideration, I got a refund for my Steam purchase and bought the game via Stadia instead. It's not perfect playing that way - occasional drops in video quality and sound skips - but for an early access game that would have been pushing my PC's capabilities in any case, it's a good fit. It's not making my graphics card sound like it's trying to take off, and if there do turn out to be any serious technical issues with the game, it's running on someone else's hardware.
Gameplay-wise I've got through the initial tutorial section, and I'm reasonably impressed so far. No bugs so far, the interface works well, and gameplay seems solid. I did have to do a little control re-binding (adding keyboard controls for camera rotation makes for a much smoother feel to moving around the world) but aside from that it's set up nicely. Looking forward to diving back in after supper, and getting to know the characters better.