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Would it not be easier to fit some kind of pad on the right ear tube which stops it from going in your ear. Some kind of silicon a bit like the suction cups that hold hooks to tiles or glass with the hook removed, the earcup might fit in the tube bit on the back. A piece of lint and surgical gauze could wrap it daily/hourly depending on how sterile you need it to be.
Maybe doesn't work to help them hang from the head though.
Airhead
Not until you'd linked it, but as with many of the steth's produced- the focus is heavy on cardiology exam- which though I love to do- only represents 1/3 ish of what I use mine for.
The OG paper by Littman suggests I should be looking at 60-1k Hz, and I guess the optimal outcome would be to produce a filter that isolated sounds either side of that frequency range.
Then it would go Bell/Diaprhagm-tubing-mic-filter-output.