Don't over think it
I'm 6'3" and have been riding 150 and 152mm cranks on all my bikes, road and mountain, for several years. I did it for knee pain, which it solved, not for any performance reasons.
I did do a lot of research before jumping in, though, and came to the conclusion that there are too many variables to predict what will happen on a particular bike. For instance, the knee-pedal relationship changes, but depends a lot on geometry. But you might not be able to push the saddle back enough to prevent a knees forward of the pedals a la triathlon bikes.
Also, remember that there are a lot of theories about how crank length will change metric x, but the bike is a machine almost purpose built to compensate for changes in leverage. So your real world experience will vary!
My advice is try it. It is not a big investment. I can't speak to US availability and pricing, but Suntour sells the XCT Jr crank at 152mm, and i use this converted to a 1x on my mountain bike. They cost 25 Euro, don't look great, but work fine. Stronglight sells a rebranded and shortened Sugino XD2 called the Impact Kid in a bunch of different lengths for about 50 Euro. These are both shortened versions of adult cranks, so plenty strong, and exactly what you would get using a crank shortening service.
If you like ithe result but want something fancier, the TA Carmina is not so expensive, so far as cranks go these days.