You obviously are not in a trust, but how does the school normally collaborate with the other local primary school and the secondary you feed into? It seems a bit late to be asking these questions now?
I’m not trying to be difficult but, as a Governor, you should be asking the SLT/headteacher why this wasn’t in place a month or so ago. Collaboration, particularly for small schools, is essential I would say. What are other schools using in the area, what are local secondaries using and surely the headteacher has already had those conversations? Also what about the local authority? If you are LA maintained or even a stand-alone academy they should be able to offer advice and support.
Sorry I can’t offer any specific advice as my experience is all secondary, but we are using Teams successfully (I appreciate it doesn’t offer what you are after). Hope you get a suitable solution in place ASAP.