I’ve got a couple of flat goals like that, where an IFTTT trigger causes it to need work.
The workaround to not being able to specify an initial rate of 0 is to specify an initial rate of 0.000000001 or something, which you then change to zero once the goal is in place.
My own wish would be that the triggering event also sets the deadline, e.g. gives me 24h to get it done. That shouldn’t be a problem in your case, because it’s your own practice that triggers the trigger.
Cool example of related goals!