MacBook Pro M1 Sequoia vs Apple 23" Display - Off, Black, On - Any Success?

Numerous threads describing this problem have been closed, so I'm starting over.

This has been affecting hundreds of users, described here, and on Reddit, for months.

Short version:

External display goes black/off, then on again, every few minutes.

Longer version:

MBP M1 2020

Just installed 15.6, but problem started as soon as I upgraded to Sequoia (15.3.2 at the time).

Apple 23" external display (my M1 2020 MacBookPro calls it a "Play").

Benfei (but also tried a Kanex) DVI to USB-C adapter

Never happened with any OS prior to Sequoia; nothing else has changed.

In addition to applying each Sequoia upgrade as it was released ...

I have tried many suggestions that were offered, including ...

• Different resolutions on the external.

• Mirroring the internal to the external, or not.

• Caffeine app (to prevent sleep).

• Turning the desktops black.

• Booting into safe mode and back.

• Removing USB hub from the setup.

• Using wireless external keyboard and mouse instead of USB.

Things I have not tried:

• Wiping my MBP drive and starting over from a Time Machine backup

• Resetting NVRAM from terminal [sudo nvram -c] (does this fix it?)

• Trading up to a MBP M2/M3/M4 (until I know for certain that will fix it)

Question: If you had this problem, and fixed it, what did you do?

I really need someone who can say "I did this, and it worked for me: ..."

Mac user since 1984, many different models, all system versions!

[Re-Titled by Moderator]