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The raised portions can be removed without separating the models (slice off the taller chunks, then stick a file between their legs to knock the rest of the bumps down), but sculpting around their feet will leave them looking like they've sunk down into the stone. Best bet is to remove them, as CIsaac suggests, and attach them on top of ready-made (bought or DIY, completed separately) bases. Just be aware that the feet are relatively thin and liable to distortion (being bent as the knife/razor blade passes through or losing material to the saw blade's kerf). To keep them completely intact, you'd have to cut, clip, or saw the base off in chunks, vertically, leaving the material under the feet to be filed, sawed, or sanded flush.
Personally, I'd look into textured plasticard - I know I've seen it embossed with cobblestone and brick patterns, before. It'd be dead easy to slice a sheet of that into squares which could be glued directly on top of the Mantic bases, covering the hole left by the now unused disk. Since it's styrene, you could attach the models with plastic cement for a strong bond without pinning (saving you time and effort), so long as you didn't pan on painting the model and base separately.
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