Love the pictures, that's a neat solution!
I picked up the goggles x last year and have been puzzling out how I wanted to do analog. I recently ordered a kit off banggood that I'm hoping will work well. https://www.banggood.com/URUAV-AV-IN-Modification-Kit-with-5_8G-RX-PORT-V3_0-V3_0-PLUS-Digital-to-Analog-Receiver-Board-Adapter-Metal-Mounting-Case-Combo-for-Walksnail-GOGGLES-X-p-2008320.html
I didn't like the 2 sided tape solution that comes with the official extension board and velcro seemed similarly untrustworthy. I was hoping for something I could slot on and off securely between storage and use.
What foam cushion is that? That looks comfy.