A size decrease would be very cool.
A simple overdrive, the size of the unpleasant surprise would be interesting I think!
I'd buy it ,provided it sounded good and offered something not already out there (a difficult one I recon, given that every Tom, Dick , Harry and their dog builds good overdrive pedals
Maybe a feedback thing that makes the circuit feedback on itself with just a pot regulating that, maybe on/off via a little switch like those found on the unpleasant surprise...
I think that'd be fun!
Such a feature might also be a fun addition to the unpleasant surprise...?