I've seen the Pennzoil Platinum ATF (all three varieties) at Pep Boys.
I sent an email to support asking for a data sheet. We'll see.
I don't have what you are asking for, but it sounds like it would be a bit more viscous than the ATF currently spec'd for most newer cars. I had an 89 Mazda FWD that called for ATF in the manual transaxle. It had a pretty good rattle at idle and notchy shifts. I eventually ordered and installed some Redline MT-90, and it was smooth as butter and quiet ever after. I drove it another 4 or 5 years like that. Even shifted good in our South Carolina winter months. Maybe I should have stepped it up only to MTL viscosity to see how that did first. I did put Amsoil MTF (synchromesh) in my nephew's 98 Escort that called for ATF. It also shifted better and quieter ever after that.
If you do stick with an ATF, your choice of something that is not highly friction modified would probably give better(faster) shifts. That Pennzoil HM ATF looks like such a fluid. Amsoil ATD is also more or less a HD full syn DEX III fluid and very shear resistant. It is more expensive than regular M1 ATF. Mobil 1 makes a HD ATF Transynd-type fluid also (syn Dex III type friction package). Our local parts house sells it for $40/gallon. It is most likely the same as Amsoil if they both are labeled to replace Transynd, a Castrol fluid.
Most ATFs out there now are highly friction modified for smooth shifts, which is not ideal for synchros.
Forgot to note I've also tried RL MTL, then switched to D4 when it became available and the "it" fluid. It did turn out to make cold shifting even easier than MTL, but I soured on it after I had one fill that turned out to be awful, and had to be dumped early, then moved to M1. I've had no problems with M1 since then, so I'll probably stick with it.
At this stage in the car's life, I'm content to maintain the status quo and not hunt down exotic fluids, and the car doesn't call for them anyway. But I was curious about the Pennzoil, and it is surprisingly cheap (~$6 vs. $9.99).