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Though I use a pentagonal drill bit for my Porlex
And you can get these where? Clearly my google-fu is weak.
photoben-
Metal option: https://www.shapeways.com/product/3TB9N9NS2/coffee-grinder-bit-for-drill-driver-cdp-l?optionId=41895157
Plastic Print-It-Yourself option: http://www.thingiverse.com/thing:545446
A possible bodge option with bonus security skewers for your bike: https://www.amazon.co.uk/Trans-X-Security-Release-Silver-Skewer/dp/B000XD019E
mmccarthy
Porlex is good, these are meant to be similar but less prone to the handle flying off issues that the porlex has.
https://www.coffeehit.co.uk/rhino-hand-grinder.html
Though I use a pentagonal drill bit for my Porlex so it's not been an issue for me.