If the water is reasonably shallow (<4'), the simplest and perhaps least expensive option would probably be a perch.

You'd need four 6' augers, two ~9-10' cross bars, 4 t-brackets, and perhaps some bunks or carpet-covered wood if you plan to get on the boat while on the perch. For my 18 I use some PVC pipe over the rear crossbar as a type of roller and then trailer bunks on the front that take ~75% of the load.

I use tie-down straps on all 4 corners when not in use. My setup easily survived a 70+mph windstorm last Memorial day. A small boat lift would have tumbled (along with the boat) for sure.