Actually, I just did something like this for a Drupal site. I based my truncation function on this: Truncate text preserving HTML tags with PHP
Use the final version of the function at the end of the comments. The function takes its $length parameter in characters, not words, but you can probably use the general rule-of-thumb of 5 characters per word to estimate, if needed.
Hook your function to the get_the_excerpt filter, and you should be in pretty good shape.
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