Yes the easiest way would be an external trigger. You can do that directly in Zapier or Make, and if you’d like to get fancier, you can trigger it off a recurring event in a Google calendar, which I do often for unusual schedules like event calendars or class schedules.
In theory you could also do this with a webflow page containing a Logic-bound form, and some javascript to trigger a submit on a timer. However that’s both clunky and fragile.