Fingers crossed that I can use on Pixel 3 one day.
You should be able to install a GSI on your Pixel 3. That’s how I got /e/ running on my Pixel 2. It is working well except for swiping the fingerprint scanner to pull down the notification shade.
Here is the link to the post on the community forum about installing a GSI on your phone.
Not that its very much help, but that feature works fine on my /e/ssential ph-1 phone