Thou shalt not cross pumpkins

Last year I grew two varieties of small orange pumpkins: Small Sugar and Uchi Kuri on the same vegetable patch, I kept some seed although I am well aware that pumpkins easily cross. However what would it matter if the small sugar and the uchi kuri would mix? I forgot that I also had another cucurbitacea on the same patch: a round variety of courgette.
So I now have loads of Courgkins or Pumgettes.... and I do not know what to do with them except feeding them to our billy goat.