Nice clamp; I don't know that it'll help much with the spring temper issue. Japanese swords, are, of course, soft, with hardened edges, and sometimes approximately spring-tempered skin-steel over a soft core; much easier to bend. The tool that used to sett the teeth of saws (called a saw-sett) is a tiny vice that works by the 3-blocks method. So on a small scale this is a routine procedure. Remember though, that this point has already been stressed; I've encountered people who prefer to rebend to a slight "s" for this reason; to not double-stress the same exact spot, but one 1/2 inch over along the blade.
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