I’d like to have the same thing. I have an IPhone Max which I use most of the time. But would like a small compact phone. For when I bike, workout, do things that I don’t want a big heavy phone with me.
I can understand your concern with using a two device under the same number. We do offer such a device called a Palm Companion Phone. Take a look here https://www.verizon.com/connected-devices/palm-companion-device/?sku=sku3130015. AlbertoR_VZW