Is it possible to output audio to both HDMI and AirPods?

You can output to more than one set of headphones at the same time, so while I don’t know of a way to output to hdmi and headphones at the same time, you could output to a Bluetooth speaker/speaker bar and the headphones.

My in-laws are in the same boat, except they’re too cheap to buy anything Apple despite having more than enough money. They want a couple of lights to be switched via voice control too but their hardware is so old and mismatched I don’t even know where to start helping them. ¯(°_O)/¯