"Reply to most recent" button when someone emails back as you're composing

Scenario: you're the middle of composing a long, formatted email when someone replies to the email thread you're replying to. You have to copy your email draft's contents, trash the draft, click "Reply all" on the most recent response, and then paste your draft into that compose window. Often you have to re-adjust formatting/links after this.

I'd like a "Reply to most recent" button to pop up in the middle of my screen (i.e., I have to bypass it) when I'm composing an email reply and someone replies to the thread. Ideally, when I click this button, it will automatically adjust my draft so that I'm now replying to the most recent reply, without making me do anything else (maybe with a little pop-up that says "Your email will be sent as a reply to the most recent message in this thread"). If I previously selected "Reply all," then my draft should still be replying all, just to the most recent email in the thread.

Bonus: I'd like Front to automatically undo send if someone replies to the email thread after I've hit send, within the Send window -- so I can decide whether I still want to send the email or whether I need to adjust / reply to their response.