Yes, you could have the weights added to the converter, but I think it's better to have the flexplate balanced [to the reciprocating assembly]. I don't know that your place would charge any extra to have the weights added to the converter during any balancing operation, but should you choose to swap converters later down the road with a weighted converter, you'll be paying for the balancing on the next converter too. But, if you run the balanced flexplate, that need disappears...just my opinion though.
