This sort of thing is right in my wheelhouse, and I've been down this road a few times. Having a shop do the work will erode most/all of the value of the bike when you add up parts of shop labor. There are a lot of little things that would need to be done to bring it back to 2018 condition and what a buyer would expect a 1900 mi bike perform and look like. One could do the bare minimum to prove it runs, but again EVERY fluid and many of the consumables will need to be changed or verified to make it right, and that adds up to a lot of hours. It's not a bike I would be interested in, but my vote would be to sell as-is and expect $1500-1800 for it.