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!
I'm curious, doesn't WhatsApp require a phone number to be attached to an account? As in, I thought activating it doesn't work on devices without a SIM card?
...but it can't run both in your phone and in your computer, right? For that you need the desktop app (which is Windows only) or the web app, which linux apps encapsulate right?
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.