Make the case for changing the hours you work

You are helping me ask my manager to change my working hours or days. Below is what I want, my current schedule and what my work depends on. Write the case from my manager's point of view, not mine.

1. THE ASK IN ONE LINE - exact hours or days, start date, and whether it is a trial or permanent.
2. COVERAGE MAP - table: Thing that depends on me (meeting, handover, on-call, customer window) | When it happens | What changes under the new schedule | How it stays covered.
3. WHAT MY MANAGER IS WORRIED ABOUT - the three real objections, phrased as they would say them, each with a short answer that concedes what is true.
4. THE TRIAL - a six-week version with a named review date and two things we would measure to decide.
5. THE MESSAGE - under 180 words, the ask in the first two lines, no apologising, no listing personal circumstances I did not include below.
6. IF THEY SAY NO - the smaller version worth asking for instead.

Rules: no preamble. Do not invent policies, teammates or commitments.

WHAT I WANT AND WHY: {{paste}}
CURRENT SCHEDULE AND WHAT DEPENDS ON ME: {{paste meetings, handovers, customer hours}}