Hi Krunal,
Thank you for the questions, I believe we have had a very nice demo during our developer days 2024 and it may be able to answer question 1 and 2.
The only concern I believe will have with step 3 as ISC rely on authoritative source for identity attributes and it is not recommended to updated the identity attributes directly in ISC so you may have to update this data in authoritative source i believe.
I hope this helps, please keep us posted.
Regards
Vikas.