I vaguely recall that Emporia Vue uses an ESP chip inside so one could flash ESPHome…?
Obviously you would lose the clouds and charts that Emporia offers, but I also recall we have projects here that could more or less replicate the same. Example from my 10 sec search:
Energy Meter Tracker - Share your Projects! / Custom Integrations - Home Assistant Community
Home Assistant Energy Insights: Reusable dashboard package for solar, battery, EV, and billing - Share your Projects! - Home Assistant Community