And because this perked my interest, my switches are a bit cracked now so Im going to replace them.
Had a look and most of the major manufacturers make neon plates for around ordinary switches.
like this or this.
Still doesn't sort the led issue, but a flicker is better than nothing.
Somewhat surprisingly, it seems that there are plenty. A Google search for "single pole switch with neon" (WITH the quotes) gets about 11,000 hits. It looks as if most have flying leads on the neon "to do with as one sees fit"! A couple of examples:
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