While we all love pretty and overdesigned UIs, for it to be more 2018 friendly make sure to add 5MB of JavaScript and CSS dependencies and new features that only works on Chrome!

As others have noted though step-based flow is not really recommended on a mission-critical UI as you can't rely on user memory. Why not just show the choices sequentially without hiding anything through various generic message screens?

Alert type: [ test ] - live

Message: other1 - [ Kauai county only ] - other2

Confirm: Send test > Kauai county only?