If no pitless adaptor, you can extract perhaps 4 ft or so of pipe, insert a "T" in the line and add a ball valve on the side leg of the "T".
The ball valve having only 90 deg rotation for open/close can then be opened for fall drainage and closed for spring start up.
If you carefully drill a hole at the end of the ball lever you can then use a rod with hook to operate the ball valve as required.
With the valve opened gravity will do the work for you.
I have numerous installations that operate that way, many pumping from lakeside with submerged pumps in which case my valve is just a couple of feet from the shore.
In a couple of wells I simply leave the operating rod in place year round.
For those I use a length of copper pipe split at the end and a cotter pin that links everything.
Works great!