The BRCA is not moving on BL equivalents in Stock and 19T because there aren't any. See this
post (one of many in a huge thread) on the 12th thread - it's the last one on the page.
Put simply, there is no equvalence between motors - either the ratings of the BL motors, or to their BR 'cousins' - and there is never likely to be. Going BL for Stock/19T in the same heat is going to force everyone to get a BL to remain competitive, and then probably have to buy a number of BL motors to keep up over the next year or so.
Most Clubs who seem to successfully keep drivers wanting to use BL motors in the 'Stock' ranges put them in a separate heat. I am sure that you have the best of intentions, but please consider the unintended consequences of what you are doing by mixing the motors in the same heat. HTH
