Yes, no, maybe. Probably depends upon the make/model of boot (ie solid or hollow lugs etc) and your skill level. A metal insert would have to be fitted to avoid rapid erosion etc. In the grand scheme of things probably easier/cheaper/safer to change boots.
In the early days of CAST the boot mod was being offered by Sole in Chamonix but I'm not sure if they still do it. Give Steve a ring on +33 450 961 163. Steve's a good guy so if he's no longer doing it commercially I'm sure he'd give you some DIY advice and he might even have some components left.
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