Having a phone which can do both: free Linux environment and virtualized Android is like a dream!
I didn't saw good virtualization on phones yet. It's either breaks something, either cost you battery. This trade-offs can't be solved easily.
Please, consider building an extension to Librem One with Anbox. Where we could attach a VPS (or buy resources from you), install standardized Anbox (with or w/o G-services) and connect to it via client app. Of course user will need to be online to use Android like this, but damn these modern apps need this anyway. And it will be a nice privacy feature: all Android stuff will be locked in some servers and won't collect that much from user. This solution let pay some bucks for energy expensive virtualization and use Android apps without severe impact to the phone battery.
This will likely not happen. Imagine having all of your Signal and WhatsApp messages stored in plain text on some server.... It kind of defeats the purpose of end-to-end encryption. Doesn't it? 🤔
1) why plain text?
2) you will be able to use web client for WA and native for Signal
And I still didn't get how both are better than email. (