This is exactly what I have wanted for a long time! I need to keep some amount of cash reasonably liquid (3-10 day retrieval process would be fine), but hate it

This is exactly what I have wanted for a long time! I need to keep some amount of cash reasonably liquid (3-10 day retrieval process would be fine), but hate it sitting around, seemingly with no way to require the bank to mandate that it is really me making the withdrawal request. Edit: Random internet poster did some testing (https://www.bogleheads.org/forum/viewtopic.php?t=382555 https://www.bogleheads.org/forum/viewtopic.php?t=382555) and found that the Fidelity Lockdown Mode will block ACATS pulls, but not ACH. Better than nothing, though still not what I want: money goes in, money does not come out until I sign something in blood.