i know of an idea that if you have a glass aivery pannel and the poor sparowhawk hits it while making its attack , it usually breaks its poor neck , so dont try that please
also , remember the "mist netters" , the RSPB used to , and still does use mist nets to trap birds for counting , i hope no one is careless enough to leave it near to their lofts on the sparowhawks regular flight path , it might accidently catch a hawk then you would have to release it unharmed