Pitri

My team uses various cameras on the big GlideCam X10 vest. There are pros and cons to each, but we recently got a little DJI Osmo X3, which works very well, including 4K. I've seen some complaints about image quality but IMO it looks pretty good.  After more evaluation we might get the m-4/3 X5, which is about $2,500 for the entire kit:  http://store.dji.com/product/osmo?gclid=Cj0KEQiA_fy0BRCwiLaQ5-iFgpwBEiQA884sOWChvTEJP_NXFyi9eehMdcvgfrgVbR0hDlofzxnQlQEaArXK8P8HAQ
Here is some material from the X5 (not mine, I just found it): https://www.youtube.com/watch?v=FVV9sjmJxmg
Low-light test shot with DJI Osmo X5: https://www.youtube.com/watch?v=Ot7RjZpoR0M

I've used the Panasonic GH3 fairly extensively for Steadycam work. The 1080p/50fps looks fine. To be honest I never noticed any moiré or aliasing. I usually use it with a Tokina 11-16mm f/2.8 stopped down to f/4. The only things that really do bother me are the dynamic range (or lack thereof) and the colors. In fact I've used the Nikon D750 as my A-Cam for almost a year now and when shooting with both the GH3 and the D750, I find myself hating the GH3 image more and more. The colors look wrong and it's very difficult to match them. I love the D750 but it's not going to be as sharp or detailed as the GH3. 
You mention that the D750 doesn't have a very high internal bitrate or internal focus peaking. Both don't really matter when shooting steadycam stuff. The image grades extremely well, way better than it should anyway. And you're not going to need internal focus peaking if you're shooting at <24mm - unless you're doing super high end stuff, and in that case you're not going to rely on the internal focus peaking anyway. 

Your methods sometimes seem like taking a military obstacle course to work rather than taking the bus.
You do know that taking the bus gets you there faster, right? And keeps you dry when it rains, or warm when it's cold... etc.
I mean, that you want to tinker around with your 6 years old T2i is all well... but to me it seems like a lot of wasted money and energy. And although you claim it to be, it will never reach Alexa-like picture quality. Do you have any actual experience shooting other cameras? If you did, you might realize what you're missing out on. Especially rolling these cameras out in the field. Don't understand why you haven't just gotten yourself a BMPCC already. Or a G6... G7... anything, really. I think in a few years you look back and say 'I was so stubborn, haha, I guess I was just looking for a challenge but ended up limiting myself'. But hey, we all got to make our choices, see how they pan out and learn from them. Though, if I stuck to shooting stills with my 2MP Kodak, I would really be seriously missing out by now and be outclassed by any camera, smartphone and webcam. We're in a digital era. You can't really allow yourself to fall behind. And technologic advancements are not here to hurt us, they're here to make our lives that much easier. I'd embrace it, not fight it. That would for sure leave you with more time and energy for other things... people want to create, be creative... sounds like those people could spend their time and energy more wisely than trying to find cumbersome solutions to problems that could be handled with more effectively. My 2 cts.