Good news everyone! I can verify that there IS a solution that does work!
It's recorded in this video -
I don't have my own videos, will record it when I'll have time.
I've ordered Comma 3, ordered a harness -
Model 3 / Y - Development Harness + Harnessbox (RHD / LHD Model 3 2019+) | eBay
(note - that for Tesla Model Y and Model 3 before highland and probably after a facelift in 2021)
Installed it a few days back and -
OH MY GOD!!!!!!!!!!!!!!!!
It's
SOOOOOOOOOOOOOOOOOOOO MUCH BETTER than autosteer!
I'm currently using it with tesla's Traffic Aware Cruise Control when Comma 3 (with open pilot software) handles the steering. (there is an option of TACC controlled by Openpilot but I find it too chill for aggressive Eastern European drivers around)
Main points:
1) No stupid speed limits! It can read 20km/hr on 2 lane country road and I can drive whatever speed I want! (up to 150km/hr). Sometimes Tesla's TACC reduces speed by itself but its' happening like once in 3 hours driving in some specific spot like complex intersection, it's not annoying for me, but if you want to completely get rid of it OpenPilot's TACC is the solution)
2) It is absolutely hands free! Just yesterday I've driven for 1.5 hours on highway and 2 lanes road and I've held a wheel maybe 0.1% of time (multiple lane changes and few very sharp turns). Not sure about nags in case of phone usage - I was constantly staring in front of the car and hands were close to steering wheel as I don't know how system work, how reliable it is so didn't feel safe enough to check the phone. (but so far so good, but need to get some experience with it)
3) It changes lanes! You just turn on blinker and slightly touch the wheel in the direction of lane change - and it does it super-fast (within 2-3 seconds vs 8-10 seconds enhanced autopilot at least in EU). This mean that it's usable even in city driving.
Frankly I'm not sure that I even need FSD in this case. Hands free driving is super relaxed, even in traffic I'm operating steering wheel like under 3-5% of time, on highways it's like 0.1% - I would say to solve that won't worth the hustle. So pity that Tesla's systems aren't that good and cannot be used this way.
I can say that for me it's 100% money well spent, and I highly recommend it to anyone who suffers from tesla speed limitations as a solution.
A few things to consider:
1) Harness installation is not very easy, need to disassemble about 5-6 panels and work in tight spaces, I kind of have two left hands so I didn't even attempt to do it. I've used service of an auto electrician to install it. (there is a manual available how to do the installation - I recommend printing it and bring with you)
2) You'll need a long (2 meters) USB C cable to connect the device, but not all cables will work, buy the best cable you can get, that is capable to transfer files with 10gb/s speed, transfer 8k video signal etc. I've had a regular charging + data cable that didn't work and had to go to a store to get a better one.
3) There are some instructions that need to be completed so you better be a bit technical, you better to join openpilot's discord server and go straight to #tesla channel, people there are very helpful. Luckily once setup it's generally trouble free and doesn't require attention.
Feel free to AMA