We're moving entirely to a wiki system so one-time conversion is acceptable. We do want to be able to convert image maps from HTML to wiki format in the future in the same way, but the rest of the conversion does not need to be repeated. So I think the one-shot migration approach, with manual tune-up post-conversion, would probably be ok, at least to get the initial job done.

Rest of reply in private message.

Thanks,

Oshyan