Since https://www.reddit.com/r/linux/comments/1gdhy7u/experimental_flathub_release_of_newpipe_on_linux/ got a bit of traction yesterday, this is WhatsApp straight from Meta running on Linux desktop using android-translation-layer.
android-translation-layer (ATL) is a Wine-like approach to run Android applications on Linux. Rather than running an Android container like for example Waydroid does this instead implements the Android API. Note that right now it’s very much work in progress and almost no app will work yet, but the fact that they have apps like Newpipe and WhatsApp running already is very promising!
Join the Matrix chat at #android-translation-layer:matrix.org and follow along!
I’ve never tried having the app on multiple devices - I specifically didn’t want it on my phone - but it’s worth a try. I use whatsapp web in firefox, and only start waydroid when I need to log in again. The third party linux apps just load whatsapp web in electron or something.