Hey there,

I've pre-purchased Humankind and can't wait for release.

I was really looking forward for trying out the new OpenDev, however Stadia is not accessible from where I live.

Any idea if this OpenDev will open up to Steam users in the future?

All the best

Although it's not a great option, try using a VPN to at least try the OpenDev. 

It closes up Wednesday, so there isn't too much time left.