Deposit insurance should be unlimited for accounts yielding less than the 1-year T-bill. Insurance should be provided via the Fed's balance sheet, not a separate fund. Bank employee and director compensation above 4x GDP/capita in any year to be paid in shares, which they are enjoined from selling while employed by the bank and for one year afterward. They can borrow against the shares to buy mansions – I want them to live in mansions – but they will lose them if they need help paying their depositors.
Accounts yielding more than the 1-year T-bill should require labeling as subject to loss.