Explore the possibilities
Explore potential suggestions that people may raise and how they might be dealt with under a “Yes” is the default policy. In reality most (but certainly not all) of the rules that exist within schools are there for a reason, and removing them would breach the “Yes” is the default policy’s restrictions of “too much time, too much money or negatively impacts on someone else”. Remember that the “Yes” is the default policy applied to not only students, but also to staff, parents and even potentially members of the wider community.
Agree upon a timescale for a trial period to assess the impact of the policy is an option, with the duration of any decisions limited to that period of time.