well, my two cents is it is much easier to modify leather rather then metal.
The real question is, how big a belt does it take? Most of those style buckles are for 1" to 1-1/2" belts. Which is not near big enough for a kilt (in my opinion).
So,
option A: custom leather work to affix the buckle to a 3" belt, with some mods on the otherside to handle the pin or hook that the buckle probably has.
option B: have a buddy grind of the hook and weld or epoxy a kilt-style hook. You'll still have to do the leather mod.
option C: get a kilt buckle blank and learn to etch or chisel 
lots of options really.
[B]Barnett[/B] (House, no clan) -- Motto [i]Virescit Vulnere Virtus[/i] (Courage Flourishes at a Wound)
[B]Livingston(e)[/B] (Ancestral family allied with) -- Motto [i]Se je puis[/i] (If I can)
[B]Anderson[/B] (married into) -- Motto [i]Stand Sure
[/i][b]Frame[/b] Lanarkshire in the fifteenth century
[url="http://www.xmarksthescot.com/photoplog/index.php?u=3478"]escher-Photoplog[/url]
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