A simple Arborist Throw Line can be made with a length of cheap cord and a heavy weight. Have a look at the technique for an Arborist Throw Line.
Try a smaller weight and a whip it round a few times. Have a look at a few video using the search term Arborist+Throw+Line
https://www.google.com/search?q=Arborist+Throw+Line
Seriously put a poster on the tree with you contact details - even an email address - it worked fro me. Julia 0 Tree 1 = Lost Drone ... Updated - Now Found! - #50 by bmsleight