That's nice looking, Tangent. The switched pot does make it nicer- not only is the panel cleaner, but good looking tiny switches are scarce. What op-amps did you choose?
If you want to ditch the dime, you might consider gluing a single silver sequin to the top of the LED. You could test it with some (kids) glue stick, or even chap stick. Have it cup-side up, like a birdbath, so the bottom acts like a convex reflector.
No, I've never tried it
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Another thought would be to trim a small piece of dynamat to replace the dime. Smaller in diameter, shiny foil on the underside, and black on the side facing the case lid.