I would not want a cable interfering with the clutch lever. If you glue or tape something to the inside of the handguard it will likely come loose eventually. Have you considered mounting below plane of headlights...lower fairing or a bracket attached to front side marker reflectors, crash bars etc or maybe to mirrors if you want the light up high?
I've been thinking of doing the same, maybe you could post a picture of them to show how visible they are, especially a daytime pic, with the headlight on too? You could drill the smallest holes possible, and use small black zip ties every few inches. that could then be covered from the inside with tape if you were worried about wind and water.
Check my thread on installing AdMore LED strips in the OEM handguards. The tape I used for that has held them in place for almost a year now with no issues at all. I'm sure it would handle your wiring with no problems.
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