At my previous company, we could switch our on call day with other people on the team. This mitigated the issue you're talking about. I never had an issue sched

At my previous company, we could switch our on call day with other people on the team. This mitigated the issue you're talking about. I never had an issue scheduling a switch with someone for the year I was on call there. That's just one specific company though, not sure if other teams allow this.