Why not reach out to someone like Brian Krebs? He has a pretty large reach and can potentially make people take notice.
Try @briankrebs on Twitter.
Try @briankrebs on Twitter.
He runs the @haveibeenpwned service
https://www.troyhunt.com/banks-arbitrary-password-restrictio...
His viewpoint seems to be that poor security practices around passwords in banks are not a big deal, due to the overall processes that banks use to prevent fraud.
https://krebsonsecurity.com/2019/12/ciso-magazine-honors-kre...