That is wonderful news. That would be a 4 inch steel casing.
What I would do is to put in a Grundfos SQ 3-inch pump. That could feed thru one of the pitless adapter. You could probably feed the power wires through one of the pipes, but only up to the well. Not thru a pitless normally, but maybe that would work... hmm. I suggest a flow inducer. Homemade and cheap. I can help identify the thinner 3-inch PVC pipe that would be good for making that.
I am not sure if you could use a standard pitless to clear the pump. My 4 inch casing has a clearway/thruway (Merrill SMCK) pitless. An alternative is to get an adapter welded up to make the casing 5 inch where the pitless is.
If I get my trimline "4 inch" (actual 3.75 inch) pump replaced, I intend to go with an SQ pump. A 4 inch pump in 4 inch PVC casing is no problem. But steel casing can grow stuff that could get the pump stuck.
If interested in that, we can figure out the best model number for you. Depth to water, depth of well are the main numbers.
You would like to make the drop pipe be schedule 80 PVC with threaded connectors, OR use SIDR polyethylene pipe and hang the pump from that. The poly pipe is easier for DIY, and the PVC, especially 20 ft lengths, is better for a hoist truck.