AV VLAN uplink to public manage switch

Hi All:

At our educational facility we are redesigning an existing 2 x room AV system with "cross-room" Audio Visual broadcast connectivity using Crestron Digital Media architechture

Each room has a dedicated Crestron DMPS-4K-350-C  + DMPS-4K-250-C units with with TV displays, Microphones and Camera's.

We have a new Audio Visual private VLAN link between 2 x rooms using core Netgear AV Line switches being programmed for the Crestron Graphic User Interface control in each space.

Netgear M4250-9G1F-PoE+ network switch (smaller room 1)

+

Netgear M4250-26G4F-PoE+ (GSM4230P (larger room 2)

My question is for how we can securely manage the AV endpoints inside the private AV VLAN?

Crestron virtual X-panel touch screen control is needed + two DMPS hardware units, Biamp audio processors; we need IP control into this new private AV-VLAN from our existing public managed Switch local subnet.

I would like to create an ethernet patch uplink from the core Netgear M4250-26G4F-POE (same AV system rack as our Crestron Managed switch) into our local managed public subnet switch which is a Crestron  CEN-SW-POE16

Any thoughts on the best way to configure this would be appreciated.

Thank you