hummmmm... well i know you can't apply another stroke to the same layer (only increase the pixels) but if i'm thinking right, one cheat that would work is,
Duplicate the layer and change the stroke colour to match the background colour (in my example it would be White)
Increase the Stroke pixel width by as many pixels as you'd like the gap to be (say... +4pixels)
Duplicate "this layer" and change the Stroke to the colour you want and increase it (say... +2pixels)

this should give you the effect of a stroke within a stroke surrounding the type...

BUT i've not tried it to see, and once more, i'm just thinking out loud, but it may work.

let us know
:)
retrocity