After looking for a while, I finally found the script in question that sets the max BP. Judging by the wording of your earlier post, you did as well. It's a Resource called Starting Resources BP, you might have to scroll down a bit to see where it mentions rsGearBP and you're right about the value being hard-coded into the script. Perhaps copying the script, setting the timing to be a little bit later than the original and overwriting the effects of the original script might be possible. You could just add a check for the born rich quality there, and if it passes change the number to 60. Now, this is probably horribly inefficient and exceedingly dirty
But it might be one option.