I hate to be negative, but what makes you think you can do in two months what Microsoft has failed to do in several years (Microsoft's Precision Touchpad is still a ways away from a Mac touchpad).
The 2 month time is because that's how long I spent on summer internships before (I rewrote Pixelgarde in 6 + 8 weeks, and a driver for a Fisher & Paykel Healthcare CPAP in less than 3 months). Second, my ankle's broken so I'm taking time off my normal work. Third, I hope that if I do the alternative (keep applying for jobs), I'd get an offer within 2 months.
While I haven't used desktop linux as a host os in years, but I agree on the sentiment that the macbook trackpad is easier/probably implemented well already.
Years ago, I spent a bit of time bootstrapping thimblemac.com which involved hacking around and using privateframeworks for the trackpad. Much of the work in that space is seemingly based off of code from back in 2009 - http://blog.sendapatch.se/2009/november/multitouch-on-unibod... , and from searching github just now staring briefly at https://github.com/robotrovsky/Linux-Magic-Trackpad-2-Driver it looks like they've gotten things implemented fairly well.
Between being more interested in surface-like tablets and watching the diy keyboard community's growth, I wonder how hard it would be to create an Open-Source-HardWare typecover that included a touch pad. There have been things like the macdec and express keyboard (https://www.wired.com/2011/02/macdec-tea-tray-holds-keyboard... , https://bullettrain.com/products/express-keyboard-platform?v... ), but given the slimness of the force touch trackpad and info around slim keyboards I bet you could make something small enough to pair with a tablet. You could start by making a slim diy keyboard (think https://keeb.io/collections/frontpage/products/dilly-3x10-or... but slimmer) that had an insert for a bluetooth apple magic trackpad, then optimize the design from there.
Comparing insert other hardware manufacturer and laying it on Microsoft isn't really fair... they have no control over what the hardware mfg's put in their laptops. And they can only fix so much in software when there are literally thousands of combinations on the market at any given time.
There is absolutely 0 issues with jittery scrolling, and out of the 10 or so people I know with SBPs, not a single one has ever mentioned that as an issue. And given that everyone in my group that is on an SBP was previously on an MBP, those cries would be loud and frequent.