Plain answer
Make the schedule flexible and the outcome specific. Choose a minimum successful week, identify several possible running windows, and use accountability that does not require somebody to meet you.
Plan opportunities, not perfect weekdays
A solo runner can take the first workable opening instead of protecting one appointment. List two or three windows and let the week decide which survives.
Keep an easy minimum
The shortest version should still feel like a real run, not a punishment. It protects continuity when the full session no longer fits.
Make the result visible
A log proves the run happened. A deadline and team consequence give it a reason to happen before the week closes.