FVWM: sticky windows on given display

Hi folks,

there's one manual step I'd like to automate with fvwm:  I'd like
to make all windows that are created or moved to given physical
display - sticky.

For now I've partially automated that based on the window name,
but I'd love to base this on the display where the window is
shown rather than on the window name.

Is there a reasonable way of doing this?  How?

Thanks,
Martin