A lot of public schools in MA did just that. Our school district had two cohorts, one of which was in school Mon, Tue, Thurs, Fri one week, the other the next week, alternating. Fully remote Wednesdays, ostensibly to do cleaning/sanitizing. Parents could also opt for their kids to be fully remote, and some kids (e.g. those whose parents were teachers, not necessarily in our district) were in school full-time, except Wednesdays.

It was definitely much better than remote-only.