Can T24 run on an existing core banking system?

1) Do you know how well T24 has been implemented on top of existing
core banking systems?
That is, would you know of any reference sites where an existing core
platform (e.g. Finacle) is retained by the client and T24 has its
'back-end' modules like settlement or SWIFT turned off and passed over
to Finacle.
Finacle then does the cash debit, credit, posting to GL, etc.

2) I know pure private banks like Credit Suisse use T24 for private
banking. But for banks with a consumer and private banking arm, do
they use T24 across both consumer and private? How do some T24 clients
do it? Or do they use separate core banking platforms in consumer and
private banks.

Thanks!