Sounds good. You're right that best pratice would involve adults having an effective way to contact the most relevant people, avoid personal expense and ensure everyone is aware of the setting's exisitng phone & video policy.
The dash cam suggestion is interesting. School owned vehicles or privately owned, insurance discounts? This page on which.co.uk explores
dash cams and the law
NSPCC has for staying safe online and on mobile
Best wishes, and have a happy, stressfree new year xx