Wow. I'm a goof.
After 3 days and like 6 visits into Premiere, I finally clicked on the correct source tab! Damn this tiny m1 Mac screen!
If you click on Effect Controls tab, you then have to click on the Source tab nested under that (rather than the source tab at the same level as Effect Controls). Whew! Now I have the ability adjust Color Temp, Tint, Exposure, Color Space and Gamma as if I were doing it in camera!!!
Too bad Premiere is the slowest piece of software on Earth. But, beggars can't be choosers.
It isn't the RAW that is a problem. It is the 10-bit HEVC 4:2:2 you get from using 4K HQ + Canon Log that crushes any computer without hardware support for that codec (almost all of them). AFAIK that pretty much limits you to late-model iPad Pros and m1 Macs. It edits smooth AF on an inexpensive M1 Mac. My 2019 3rd-gen iPad Pro won't even try to open them, though