I’ve been looking for the Mono Mix of Help! for a good long while to no luck. No VHS, or laserdisc has it.
I tried buying the first issue Laserdisc but that was a dead end. Mono compatible two channel stereo.
You can find the correct mono mixes for the songs is on the Back to Basics: Help! Sessions CD.
https://www.the-paulmccartney-project.com/album/help-studio-sessions-back-to-basics/
The CD also has the acetates given to the film production (which includes the “You Like Me Too Much” and “Yes It Is” acetates, which didn’t make the film). There’s also the AMC Presents AHDN & Help CD bootleg from the AMC broadcasts. The AMC broadcasts themselves have found their way to bootleg series on DVD called Filmography. Help! is on Filmography 2.
https://www.discogs.com/release/14472421-The-Beatles-Filmography-2
You may also want to check out the Beatleg Forums.