latching relays

Hi all. I think a latching relay is the way to go for a pico-based job I have in mind. However the prevalent ones all seem to be controlled by a pulse on a single input wire which flips and flops the state.
No doubt they reset to a known-state at power-up. But I see no indication of any way of resetting them to that known state without turning off the power - eg after reloading the pico control program.
Has anyone used these and can offer advice please? Thanks.
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Mike Scott
Harlow, England