I am old fashinoned and use Arkansas stones too.
And I carry this -- A steel diamond rod - I have one in my truck door and one in my pocket when I hunt. It will put an edge on anything quickly - even serated.
The Diamond Steel will screw into the handle to be hid. Easily pocketable.
And as Cayugad stated - high quality steel keeps its edge and will regain its edge quickly with the right stone.
About 15 bucks.
JW