Ok then - well a few years back I bought some EL Wire and wanted to put it on my WH20.
Temporarily I decided to use stock standard sticky tape to see if I liked the look of the EL Wire in the game.
I was amazed that you just couldnt see the tape at all when I first put the wire on with it.

Years later -  - - - - - - it is still there and invisible ( nearly )
Normally I wouldnt do anything so 'dodgy' but it worke dwell and you cant tell so I left it.

http://home.kooee.com.au/brainsnap/wh20lighting.htm