Like you, I'm a full season midwest whitetail guy, with annual or every-other-year trips out west for elk, mule deer, etc. I also rifle hunt public land in northern Michigan annually which involves still-hunting and finding a good spot on the ground to be on "stand" for an hour or so at a time. Even though it's rifle hunting, to be effective, I am sometimes interacting with deer in thick stuff that ends up with some short range shots. Given my experience as noted above, here's my take on Sitka for what it's worth.
Two pieces that absolutely will translate between stand and western hunting are the Jetstream vest and the Mountain vest. I know these aren't jackets, but they are good to use anywhere (midwest or west) as the outer layers when a vest is just the right amount of added warmth. The real midwest/west versatility is with their windproof properties and layering. Layering them under any jacket instantly improves the warmth and effectiveness of the outer jacket. As an example, I have a Rocky fleece jacket that is comfortable, very quiet and has a harness pass through for the stand. It has zero windproofing though so windy days in the stand really hampered it's use. Add either of these vests underneath my harness and fleece jacket and now I have a comfortable, silent tree stand jacket with more use later in the season. The vests are thin so you can add more insulating layers over them as needed. Being sleeveless, the layering bulk is minimized in your arms. They fit seamlessly into my midwest and west layering for a wide range of temps and conditions.
I have a Jetstream jacket and I love it for western hunting and the northern Michigan hunting I describe. It's windproof, decent warmth, durable, has a hood and puts up with some rain/snow before needing a hardshell. For using it in the stand (which you can do), you give up the tree stand harness pass through and there are quieter materials. It's not overly loud for sure, but as you know for archery hunting and close quarters it doesn't take much rustle to focus a deer's attention on you in the Midwest. The other con is the fit of the jacket is athletic. There isn't much room for layering underneath it. However, the same logic I mention above for the vests applies to the jacket. Using my example, if I put my harness on over the Jetstream and the fleece jacket over both, I'm warm, windproof and the harness isn't a hindrance sticking out the neck of the jacket.
For the really cold stuff, I have two different systems. For out west, I add puffy jacket outer layers over the Jetstream jacket that are packable, but aren't super durable for thick vegetation and are louder. I like the FirstLite Uncompaghre (very comfortable and maybe quiet enough for tree stand use) and I just got a Sitka windstopper Kelvin down jacket for super insulation (it's nice but IMO way too loud for tree stand use). For midwest stands I have the FirstLite Sancturary jacket. Super warm, quiet and has a harness pass through. But, it's heavy and you don't want to use it for mobile hunting. A lot of times, I'll walk into the stand with a Sitka vest over my base layer and put the Sanctuary on over everything at the stand.
I don't have any of the Sitka whitetail-specific items because I have tried, like you, to bridge the clothing gap between the hunting styles as much as is possible. It seemed to me from my research that the pieces I have blend concepts decently well and perhaps moreso than going with the whitetail items for dual use.
So, bottom line, I don't think there is one do-everything jacket that fully bridges the gap between these different styles of hunting. You give up a little something one way or the other. That isn't just a Sitka issue, however, it's the same with all hunting clothes.
