Hi,
yes, this is for SCA, but payment amount is taken from select list, and it works well with this. e.g. selected value is saved to total element and then this total is sent to stripe button using hidden input bfPaymentSelect (same as for paypal).
Give me some time to make a better test, and I will let you know
You can test it too on some test site, in case that something is wrong there that you don't destroy original form/site
Regards,
Tihana