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Right-ho. I didn't want to burden you with too much detail... but you'll need to know that both signals wouldn't be going through to the TV at the same time. I need a 'monitoring' device (i.e. a small TV) in order to see what's on a DVD player, and the same on an adjacent set-top box, but not simultaneously. (I use the stb exclusively for radio, so the TV isn't 'watched', but I still need some sort of TV monitor to see what I'm doing!
I suppose I'm going to have to settle for one of the remote-control versions, although it adds one extra 'move' - in that when I insert a certain DVD, I'll have to use the remote to switch the HDMI splitter to that channel.
I was trying to eliminate moves, by (e.g.) getting shot of an elderly CD player, and using the DVD player instead, but the CD player at least had a rudimentary display on the front, whereas using the DVD player means I need the external screen.
It was easier 70 years ago.
A.