I plan on doing the same for the PWR question bank but that probably won't happen until I get my license due to time constraints. Maybe a little sooner depending on how the upcoming simulator phase of training goes. It would help if there was an HTML savvy volunteer to assist in modifying the various display errors for certain questions that occur after first running the import script.
For now, you can restrict the search results of the BWR questions to those that are also PWR questions using the search field. The search field looks at text in the question, answer, distractors, and the actual question id (QID). Questions common to BWRs and PWRs will contain the BWR QID followed by the PWR QID in parentheses so try searching for "(P" without the quotation marks.