A cheap post lift is rated 8-9K#, so half is 4.5K and are ~$3K. Fabbing the cradle would require some additional investment. Another pump would give you 2. Build 2 sell 1 and not cost you much. The footing to anchor the post will require work. Most slabs are 3-6" and you'll need more than that to carry a point load of 2K#
You won't want to hang anything from the bottom chord of a roof truss. I would check to see what the truss load is designed for before I would hang anything from the top of one. Most are not designed initially for those additional loads.
"Let us endeavor to live so that when we come to die, even the undertaker will be sorry." Mark Twain