Step two will be for me to sift through the offers and figure out how they can be pieced together into a plan of action. It seems unrealistic to expect that we could raise more than... $20k?... from detail-oriented perfectionists, so I still need to figure out how best to constrain the scope of the goals enough to get this done with scarce resources (unless someone at Microsoft wants to kick in $1m in exchange for the affection of several thousand developers? :D)
It doesn't help that my day job is running a company in the process of launching two new products -- this has a tendency to gobble up available evenings and weekends and I wouldn't recommend it. But I've added it to my todo list to puzzle out how to combine these dev resources into a plan. It's plausible that the current libinput developer could be swayed by this outpouring to help me build a viable plan to build a modern Linux touchpad driver. I'll start there.
Look for an updated blog post with progress in the next couple months. And who knows, maybe I won't still be using this 10 year old hardware in another year?