Simple cec question

Ok so i won’t to connect pi3 to hdmi so i cant have a play with cec component. But i dont have any hdmi ports spare. Older tv with only 2 ports 1 has the play station and the other has the sound bar out. Sound bar in has a fire stick. Dont really want a hdmi switch that i have to mess about with. Any ideas . Many thanks

Have a look to see if there is a cec app that can run on the fire stick. Perhaps you can find a way to forward results to HA. Maybe a Tasker project?