Some interesting ideas,
I've done some alternative Sgian Dubhs in the past in the form of bottle openers - in fact I was wearing one of these last night to the Loch Ness Hogmanay Festival see:
http://www.rainnea.com/safety-sgian-dubhs
If I can find a multitool that could be attached to one of my Sgian Dubh handles then I'd give it a go.

Rab