Better to phrase it as: "Are you open to the idea of a 4-day work week for me? How would that affect my overall compensation?"
I think it's unwise to reveal your willingness to be paid less. Mostly because you should never reveal your willingness to be paid less. Never leave money on the table.
I think it's unwise to reveal your willingness to be paid less. Mostly because you should never reveal your willingness to be paid less. Never leave money on the table.