Customize "Connect HDMI" screen

We have 4 meeting rooms, each with a Meetup 2 in BYOD mode, with the 5m "active" USB-C cable running from the unit to the meeting table.

Because the Meetup 2 doesn't provide any power/charging (PD) capability to the connected laptops, plus 5m isn't quite enough distance, we've invested in a Wavlink Thunderbolt 4 dock, and this allows the input from the Meetup 2 active cable, and output via USB-C to laptops, which also provides power they need to charge. When the laptop is plugged in, video/audio and screen sharing is working perfectly - no need for HDMI.

However, because the Meetup 2 "detects" that the USB-c cable is "plugged in" to a device (the dock), but it's not receiving any video signal from the dock (until the laptop is plugged in), it shows the "Connect HDMI" screen on the TV, and we can't edit or change this.

We don't use HDMI at all, so this message is confusing to staff/visitors as to what they should be doing to get connected (just plug USB-C in)

This is different to the BYOD idle screen which we have customized already.

Any suggestions?

Thanks!