Thank you guys, this has been most helpful! I’ll give these a go over the next few weeks as and when I get time!

install the MMM-Admin module. It will serve up a webpage and you can control the HDMI from there…even use it on your phone. works well

@Shrike Since I don’t use a cam to my setup I can’t really tell. But I guess the easiest is going all Raspberry PI (stock power supply, raspberry camera and a pi 3)