In standard Cat 5 networking, only four wires are actually used (the greens and the oranges) (sounds like an order at The Fat Duck).
So your six conductors will be fine.
BUT you need the crimp tool to do it, and a magnifying glass of a fair size.
I have the tool and a copious quantity of plugs. PM an address and I'll post them to you with instructions.
Experience tells me to avoid new technologies if you can use good old copper.