Congratulations, you have joined many excellent engineers in designing a toy solution to this problem. Some of the others were documented in RFC 8446 (with TLS 1.3 itself) but if you didn't cheat by looking there yours was an independent invention.

Sadly this doesn't scale, as you almost seemed to realise by saying you'd just respond without waiting for the commit step to complete. Next I'll respond to your dismissal of this huge problem in the other thread.