Don't really follow the logic.
For such a small amount (50k)
Thinking best to have the 800/400k in a dedicated account for immigration purposes and open another account with a credit card with whatever funds you want to place in the account.
Having stated that, I use to accounts for immigration 600k in a FD account and approx 400k in a savings account.
Touch neither and use another account for day to day banking.
Sort of slightly regret that.