I'm CTO of a very early stage startup and $50/mo to allow my CEO to read and edit the database is an easy decision.
If not, you need some sort of admin interface (could be a couple forms) to address this properly so invalid data can't be plopped in OR any changes should be documented and sent to someone technical even if it's a typo fix. It seems fun and easy but production data isn't something you should wrap in an excel interface and give to any and everyone. $600 a year so your boss can update names and dates is kinda hard to justify as well.