Dave Plowman wrote:

I'm sure there are lots of ready made solutions - at a price.

Surprisingly, that doesn't appear to be the case. So far I've found only
one, the Monoprice package I mentioned earlier.

And perhaps I should apologise for saying this on a group that's ostensibly
devoted to DIY but I wouldn't object to paying for a commercial product that
could do the job, especially if I couldn't achieve as neat and efficient a
method myself.

Bert