Mmm... this could be nice to use the clock out as a sort of trigger...
Anyway, for this kind of task, I use an EHX Clockworks (a clock divider) between the Drumbrute and other devices, so I can sync them at different speeds (if I'm not using midi clock, of course). Maybe there are better tools in the modular world (the Clockworks lacks a reset button to re-sync all the channels), but it's just an idea of how it could be done.
Another thing you can try, it's to use the Metronome out as a clock/trigger. It may not work with every device, but it's worth trying, since the metronome slowest division is 1/4 of a measure. I tried it as an external clock for the Clockworks and it worked fine, but it really depends on the device you want to clock (some may accept a strong and clean sound as a trigger, while others may require a proper clock signal).
As cool bonus, the metronome swings when set to 1/16 or less, and so the slaved device... edit: I remember wrong, the clock doesn't swing (I don't know why I was sure it did), I just tried syncing my Mother 32 to the metronome out and it works fine, but there's no swing (maybe I could get it by using the individual output of an instrument? I could also sequence strange rhythms that way....)