With only Wilbur, Orville and a couple of blokes who remember the 707 above me on the seniority list, I feel comfortable in suggesting that single pilot IFR is best conducted in total silence.
Let's just do away with calls, checklists and all other interaction at the sharp end and commit it all to Tweets. Them's that have the most Twots and Tweets win. Sectors are to be given to the lad/lass who has the most Tweets prior to launch. Maybe Toss can add that to the iToss app.
Comms are so bad on flight decks without gingerbeers that I just listen to Barry Manilow and do the sudoku