Sorry, Sense home users still need to use a unique email to set up each account. I say “home users”, because solar installers and others who set up numerous Sense monitors potentially have access to Sense Pro tools that includes a Fleet Management app. That app can watch over numerous Sense accounts, but is a separate product, and has more top-level monitoring features and none of detailed viewing and tweaking features of the core Sense App (or so I have been told by a couple of installers).
Just wanted to point out that there is more to Sense than just the end-user product, and
Sense also appears to be doing enhancements on the account and authorization end of the end-user product, but there is nothing announced other than this.
So I would bite the bullet and set up a second account. I have two accounts, one for my main Sense unit and one for a Sense I use purely for two monitoring 240V circuits (DCM), my EV charger and a floor heating subpanel.