If you are not successful, and you'd like "a pair of eyes" on just what's happening let me know. I am always curious as to how and whether a solution can be found for simulated drag and drop using a screen reader for a given task, as it seems to have spotty success overall, at best.
Brian - Windows 10 Home, 64-Bit, Version 1803, Build 17134
The real art of conversation is not only to say the right thing in the right place but to leave unsaid the wrong thing at the tempting moment.
~ Dorothy Nevill